Photoshop Elements Trial 2018

Does anyone know how to find out how long I have left on the 30 day trial for Photoshop Elements 2018? Upon initial install, the software asked me if I had a key or wanted to start the trial, to which I selected start the trial. That was on 12/27/17. Today is 1/30/18 and I have used the program many times in the last month. Not once again has it ask me if I wanted to continue the trial or if I had a key. In anticipation of buying the software after the trial, today I purchased the product and now have a key. However, I cannot for the life of me figure out where to enter the product key now. Its almost like its a registered non-trial version of the software like I've owned before (PE 13, etc.). Can someone tell me where to enter the key?

Thanks for reading.