Narrative coding - change name of field in address section

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Hello all,

In the past I added a field that costumers can include specific additional detail when they create account. That detail always appear as a note on their record. 

My question is how to make a change so a customer can notify me of this detail AFTER they already created their account. If it is possible to make it that the update will appear automatically as a "note" that would be great but if it is not possible then I don't mind just to change the address form where it says "Company" to my title and I will make changes manually on records.

Many thanks in advance.