Please Help

[paracosasdeotrorollo]

Hi, , I installed the open chrome extension, thing is chrome itself was bugging me for some error and switch to opera. thing is after i did that 'terminal' instructions and so on , my laptop isnt working for my job. is been a whole day trying to fix it but i cant. i dont know nothing about code. please help me. im a music producer, and i have a deadline in 2 days and i can't open my DAW software to finish .. im really freaking out. can i please get some instructions to uninstall and get my os x the way it was before i installed this?? maybe it was that other application (node) that i installed because it wasnt working and i did that other run also.

anyhow, please if anyone knows how i can get out of this mess !! good day to everyone!