How can i remove the (original mix) in the filename and title?
You can use an action "Guess values" with
%title% as source format and
%title% (Original Mix) as guessing pattern.
Please also use the search function of the forums. It's really good. This has been answered plenty of times already.
I dont understand what you mean or what to do when u say "guess value" action
Edit: nvm it was under Actions (Quick)