Can't enter my key number, where are the instructions?

Hello David,
We will help you sort it out. I have sent you an email, please reply to my email with the information requested and we will do our best to assist you.

On the screen it tells you the 3 easy steps tp enter your key, but there are no 3 easy steps. 
How do I enter my key?

Hello David,
We will help you sort it out. I have sent you an email, please reply to my email with the information requested and we will do our best to assist you.