How do i change an Unhexed key?

I got 8 unhexed keys from this dude and i dont know how to change them

If you know how can you please add me on skype and walk me through it.

Skype : poisonoustaco67

Reinstall Game and change the Key in the setup or use darkys key changer! It can convert keys from hex to nonhex and nonhex to hex and check if the keys are banned

I helped him, he was scammed

Yeah, Kobra752 scammed me of 30$.