Adobe Pro DC - How do I change the commenter's name on the document?

Here's the dilemma  - one Adobe account - two users in the same office. How do we utilize Adobe Pro DC for editing documents for clients, but without having primary account name popping up  as the author of comments?

How do we change the author name for times when it's needed? Please give us way to add user and setup.

Thank you,

Pam