Om du har glömt användarnamnet, kan supporten skicka det till dig igen.

Here om means if. It introduces a condition:

Om du har glömt användarnamnet = If you have forgotten the username

It is not the om that can mean about in other sentences, such as Vi pratar om jobbet = We are talking about the job.

Har glömt is the present perfect, and that is the natural choice here because the result matters now: the person does not remember the username at this moment.

• du har glömt = you have forgotten
• du glömde = you forgot

In this kind of support/help context, Swedish often uses the present perfect because it describes a current situation caused by something in the past.

The base verb is glömma = to forget.

After har, Swedish uses the supine form, so:

• glömma = infinitive
• har glömt = has/have forgotten

So glömt is the form required after har in perfect tenses.

Because Swedish normally writes compound nouns as one word.

användarnamn is a compound:

• användar- = user
• namn = name

So användarnamn literally means username. Then the definite ending is added, giving användarnamnet = the username.

This is very common in Swedish:

• telefonnummer = telephone number
• lösenord = password
• användarnamn = username

That -et is the definite article attached to the noun.

Swedish often puts the at the end of the noun instead of using a separate word.

• ett användarnamn = a username
• användarnamnet = the username

The noun användarnamn is an ett word, so in the definite singular it becomes användarnamnet.

This is because of Swedish V2 word order.

In a main clause, the finite verb usually comes in the second position. Here, the whole om clause comes first:

Om du har glömt användarnamnet, ...

That first clause takes the first position, so the finite verb in the main clause must come next:

kan supporten skicka det till dig igen

If there were no opening om clause, the normal order would be:

Supporten kan skicka det till dig igen.

So both patterns are correct; the word order changes because something else has been moved to the front.

Supporten is the definite form, meaning the support team / customer support.

• support = support
• supporten = the support

In this sentence, it refers to a specific support function that both speaker and reader understand, such as the website's or company's support department. That is why the definite form is natural.

Because användarnamn is an ett noun, and the pronoun for an ett noun is det.

So:

• användarnamnet → det

If it were an en noun, Swedish would usually use den instead.

For example:

• lösenordet → det
• koden → den

Yes, both are possible.

• skicka det till dig = send it to you
• skicka dig det = send you it / send it to you

In this sentence, skicka det till dig sounds very clear and natural, especially in service or support language.

So till dig marks the receiver of what is being sent.

Igen means again.

Here it means that support can send the username one more time, so in natural English it often corresponds to send it again or resend it.

In the sentence, it comes near the end:

kan supporten skicka det till dig igen

That is a normal position for igen.

Not always. In modern Swedish, the comma is often optional in a sentence like this.

So both of these are acceptable:

• Om du har glömt användarnamnet, kan supporten skicka det till dig igen.
• Om du har glömt användarnamnet kan supporten skicka det till dig igen.

The comma can make the sentence a little easier to read, but many writers would leave it out.