1. Enter JUST your character name for example: "wempire".
2. Enter your UserID & LIMITED API key, this is the two yellow one's on the Eve Online website.
3. Be loged in to TS3 and hit Submit.
If you are getting a error in registering. Look here. The API Access Mask needs access to: "CharacterInfo"
"Standings" and "AccountStatus".
Any error let wempire know.