Change Basic Authentication to LDAP

I have a Code collaborator system using Basic Authentication.

Now I want to change it to LDAP authentication.



I have re-install it with the LDAP setting. It seems to be OK.

However, the next step is I want to link the Domain Account with the old existing User Account.



e.g. Old Account "Toby", now the Domain Account is "TobyWong".



How can I change the old Account Toby to TobyWong so that I can check my reviews.



Thank you.



Toby