Steve on 07 May, 2019 04:57 PM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
I am not quite sure I understand what you mean by "I thought I could sign into the key I already had created.". The OpenPGP key you created is created locally on your computer. There is no online service that has the secret key part. If there was that would be a security nightmare. If you do not have any backup at all, the key is probably lost.
This KB-article explains what to do if you forgot your password or lost access to your secret key.
Let me know if you need further assistance after going through that KB.