What template peace to edit?

[NSOrdinary]

I want to edit this into bootstrap:
http://prntscr.com/mk8psz


Where can i edit username link code

so i can fix this??
http://prntscr.com/mk8q7h

[WallBB]

Modify the text {$lang->welcome_back} with this code

 <a href="{$mybb->settings['bburl']}/member.php?action=profile&uid={$mybb->user['uid']}">{$mybb->user['username']}</a>

You can apply any styling you want to the above link.

[NSOrdinary]

Thakyou!