i want to remove this and make something like here on ubbdev.com so that my profile | register| blabla is into the thingy where it's says Hello, Bassies n' stuff how can i realise this ?

Take a look at this post. I believe that's what you're looking for.

yeah that's it but those files are already made
then will my other hacks not work

Your other hacks will be unaffected.