Re: update record with check new user

["mtrueblood"]

In the server behaviors panel with the submit button selected, from the (+) 
button choose User Authentication then Check New Username. There you can set 
uniqueness and requirements. From there, on the behaviors panel (not server 
behaviors), again with the submit button selected, select the (+) button and 
choose Validate Form. From there you can set requirements and validations.

 That should at least help.