Renaming Time Capsule User Accounts

I used Airport utility and selected a user account X on my Time Capsule. Then I used the EDIT button and changed the name of the account to Y.

It seems to have created an new account naed Y, but the old account name, X and contents not visible. How can I access the old account name (X) and files ?

Will creating a new user account with the old name work ?

Will happen if I reverse my actions - select the account (Y) and change the name back to the original name (X)?