Installation help

Legend tag in Add user Form in moodle 2.7

 
 
Picture of mano bobi
Legend tag in Add user Form in moodle 2.7
 

I am new to moodle and using moodle 2.7 . Categories in legend tag i make its display inline changing its css. but i want to put category headings into tabs, mean at one time just one category fields should open (mean if i click at general tab just fields of general information should expand other should not . ) i tried to search in code but could not found in which file HTML of add user Form exists. please assist me in which file i should make change in to got my requirement.

below pic will clear how i want to make my add user form.



 
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