Negative Lab Pro Plugin if greyed out - can not select it

Just installed the trial version of Adobe Lightroom Classic and the trial version of Negative Lab Pro. I added Negative Lap Pro as a plug-in to Lightroom Classic and restarted the program. When I go to Plug-In Extras to bring up Negative Lab Pro - it is greyed out and I can not select it. What am I doing wrong? I am completely new at this.

Solved - I hadn’t selected a photo first. Oncwe I had an image to work with it all worked fine.