How to MOD?

Please someone give me links for me to MOD i used photoshop and it didnt work or maybe i installed wrong shit. I need to learn how to mod please tell me how to thx!

well not get it right but I think you
want to edit any files. dds?

I use good paint net of any files to edit and convert. dds

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come to my website and go to chatbox please

what is your site?