Eu vou copiar o endereço e colar no e-mail.

Yes, you often can drop eu in Portuguese because the verb form already shows the subject:

• (Eu) vou copiar...

In Brazilian Portuguese, subject pronouns are used more often than in European Portuguese, but they are still frequently omitted when the subject is obvious. Keeping eu can add:

• clarity
• emphasis
• a more explicit, conversational tone

So both are natural:

• Eu vou copiar o endereço e colar no e-mail.
• Vou copiar o endereço e colar no e-mail.

Vou + infinitive is the very common way to talk about the near future in everyday Brazilian Portuguese.

So:

• vou copiar = I’m going to copy
• vou colar = I’m going to paste

There is also a simple future tense:

• copiarei
• colarei

But in normal speech, vou + infinitive is much more common and usually sounds more natural.

Because both infinitives are linked to the same auxiliary verb vou.

So:

• Eu vou copiar o endereço e colar no e-mail.

means:

• I am going to copy the address and paste it into the email.

Portuguese does not need to repeat vou before the second verb if the structure is shared. You could repeat it:

• Eu vou copiar o endereço e vou colar no e-mail.

But that is less compact and usually only used for emphasis or rhythm.

Portuguese uses definite articles much more often than English.

So where English often says:

• copy the address

Portuguese naturally says:

• copiar o endereço

Also, endereço is a masculine noun, so it takes o:

• o endereço
• um endereço

This is very normal in Portuguese and not something you should always translate word-for-word from English.

Portuguese often leaves out a repeated object when it is already clear from context.

In this sentence, o endereço is mentioned with copiar, so after that, the listener already understands what will be pasted. Because of that, Portuguese can simply say:

• copiar o endereço e colar no e-mail

A more explicit version would be:

• copiar o endereço e colar o endereço no e-mail

But that sounds repetitive.

Also, colar ele is usually not the best choice here. Object pronouns in Portuguese work differently from English, and in careful grammar you would more likely see forms like colá-lo, though in everyday Brazilian Portuguese people often avoid those clitic forms and just omit the object when it is obvious.

Yes. The basic meaning of colar is to glue or to stick. But in computer and phone language, it also means to paste.

So:

• copiar e colar = copy and paste

This is exactly the normal verb Brazilians use in digital contexts.

No is a contraction of:

• em + o = no

So:

• no e-mail literally means in the email

With verbs like colar, Portuguese commonly uses em to express where something is pasted:

• colar no documento
• colar na mensagem
• colar no e-mail

In English, we often say into in this kind of context, but Portuguese often just uses em.

Because colar normally works with the idea of placing something in/on a space, not to a destination in the same way English sometimes frames it.

• colar no e-mail = paste it into/in the email
• enviar para o e-mail = send it to the email / to the email address

So no e-mail fits the verb colar much better here.

It is usually masculine:

• o e-mail
• um e-mail
• no e-mail

That is why the contraction is no and not na.

Also, in modern Brazilian Portuguese, you may see both:

• e-mail
• email

Both are understood, and email without the hyphen is very common.

In this sentence, it most likely means the email message or the email you are writing, because you are pasting something into it.

That matters because endereço can also mean address, including an email address, street address, web address, and so on. So depending on context:

• o endereço could be a physical address
• o endereço de e-mail would specifically be an email address

If the meaning shown to the learner is already clear, then the grammar still works the same way.

Yes, absolutely. That is a very natural alternative.

Compare:

• Eu vou copiar o endereço e colar no e-mail.
• Eu vou copiar e colar o endereço no e-mail.

The second version makes o endereço the object of both copiar and colar. It is slightly more compact and may sound especially natural in instructions or casual speech.

Both are correct. The version you choose depends mostly on style and what you want to emphasize.