How can I edit the Hello There, Guest! from top section by log in buttons?
Edit the header_welcomeblock_guest template. You can remove {$lang->welcome_guest} from it.
(2014-09-03, 09:40 PM)Destroy666 Wrote: [ -> ]Edit the header_welcomeblock_guest template. You can remove {$lang->welcome_guest} from it.
Can I also just add my own text to replace it?
Yes. Either add it to the mentioned template or edit the language string:
inc/languages/[your_lang]/global.lang.php -> $l['welcome_guest'] = "Hello There, Guest!";