Hi Guys! I Lost my phone couple of weeks back with 2FA on it and i dont have my back up codes.. I've been in contact with almost every Exchange and waiting for answers but now i found a note with what i belive might be my Secret key for Bittrex. But where can i use this Key? i cant find anything on their website so im asking you guys. Please help me out 

I have lost my phone.. actually it was stolen and i dont have a backup code for my 2FA cuz im too damn stupid. I had a print on it in my LOST phone... and i was going to transfer it in to my computer but guess i was too stupid to even do that.. i didnt know that much about GA to be honest i never used it before and signed up because of recommandation.. Im so mad at myself and i really dont know what to do.. So if anyone can relate or know how to solve this problem please reply me as fast as possible.. thank you guys!