Yep, you'll have to find the text in the file, usually with Ctrl+F, and change it to what you'd like. ;3

Would it be in lang_myadopts.php or myadopts.php?

Re
 

Yes it is - edit the myadopts.php file. :3

And finally, right here, the last thing I want to change:

"Pound Double Bubbles - I don't want it anymore!
Do not pound DO NOT Pound Double Bubbles"

How to change this text?

Re
 

O.o I thought it would be on the myadopts.php file, but it's not there... maybe try pound.php, lang_myadopts, lang_pound, and php myadmin tables?