Is the sentence Please go to register number 1 correctly translated in Spanish as Por favor vaya al registro numero 1?
Can the verb be used as noun in this case?
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Depending on what you mean by register, your translation is almost correct. You are just missing a comma after por favor:
Por favor, vaya al registro número 1
In Spanish, this additions with a meaning outside the main sentence are always enclosed in commas. In this case, por favor adds nothing to the meaning of the main sentence (vaya al registro número 1), so you separate it using a comma.
I don't understand what you mean with using the verb as a noun; the only verb is go and I cannot see which noun you intend to use instead.