How do I activate a Trial Install?

I bought Parallels last summer, installed it, used it, then stopped using it for a while.

Recently I downloaded a new "trial" version and started using that. I had lost my activation key so I installed it as a trial version. Now I want to activate it and got my activation key.

How do I activate this trial installation so I do not have to reinstall?

 

new or old activation key?

Hugh W

 

I assume it's my original. I telephoned Parallels, got a helpful "account executive" who emailed me my key.

 

Nevermind. I should have looked before I asked. Was easy and is done. Thanks to all.