The best way to move the tab in that version is open the dbtech/vbdonate/hooks/process_templates_complete.php and search for navtab_middle and change both instances to navtab_end.
Much beyond that their is no way to have control over the exact position of the tabs in the earlier versions of vBulletin, unless of course you are using vBNavTabs - DragonByte Tech | vBulletin Mods & Addons then you have more control.