gridmarket - where is the location of the "store forums register" menu in the css or php

I just want to add some more options to this menu. I couldnt find the code for it (actually I am not sure where the code would be located anyway, javascript php or css?)
I dont need the drop down menu here so If I know where its located I can disable it as well.

Also where is the code to add or delete menu items from the top amin menu (circled) I assume its in the marketpress files?