Learn Farsi: تو باید نوار را به طور صحیح بگذاری.

صحیح (sahih) is an adjective meaning "correct." While in very casual, colloquial Farsi you might occasionally hear adjectives used as adverbs, the proper and productive way to form an adverb of manner (like adding "-ly" in English) is by adding به طورِ (be tor-e) or به صورتِ (be surat-e) before the adjective. So, به طور صحیح is required to precisely say "correctly" or "in a correct manner."

Could I use به صورتِ (be surat-e) instead of به طورِ (be tor-e) in this sentence?

Yes, absolutely! به صورتِ صحیح (be surat-e sahih) means the exact same thing here. Both phrases are completely interchangeable for creating adverbs of manner. به طورِ translates closer to "in a ... way/manner," while به صورتِ leans slightly toward "in the form of," but functionally they do the exact same job.

Why does the verb بگذاری (bogzâri) start with a ب instead of می?

This is a quick refresher on the subjunctive mood! Because the sentence uses the modal verb باید (bâyad - must), the following verb has to be in the present subjunctive. To form it for گذاشتن (gozâshtan - to put/place), you drop the indicative prefix می (mi-) and replace it with the subjunctive prefix ب (bo-/be-), giving you بگذاری.

I sometimes mix up گذاشتن (to put/place) with (to perform/pay). How do I know which one is used here?