Add data to Admin Group Members Page

I am using ASPRunnerPro 6.1 Build 2503.
I am trying to add some extra data to the Admin Group Members Page so the data that is being displayed is clearer for me to view.
Here is what I have.

Users Table Fields: UserID, UserName, Password, Email, and a few more fields.

XXXXXX_ugmembers Table Fields: UserName, GroupID.
The admin_members_list.asp page displays the "UserName" field from the XXXXXX_ugmembers Table under the Users Column. When the security is being set it is pulling that value from the Users Table "UserID" field. What I would like to do is append the "Users" table "UserName" to the display along with the "UserID" field that is being displayed.
The reason for this is because where I am UserID's are just a series of numbers and the name is kept seperate for privacy reasons. When trying to assign people to the right groups it gets increasingly difficult as the site grows and the number of users grows when all I can see is the numbers on that page.
What I see now Example:

Users Administrator Developer Guest

123456 X

654321 X
What I can't figure out how to do:

Users Administrator Developer Guest

123456-Doe, John X

654321-Smith, Jane X
Thank you in advance for any ideas.