VarAC - HF discussion forum

Hi Folks, I'm new to this so still learning and would like to get chat working and running. I do have learning disabilites but i did get VARA HF up and running. Also trying to learn as I'm also a American Red Cross volunteer in there DST GAP. I have been told to goto the Edit Fequency Drop Down List so I can add that dial fequency as in one of my photos but when I click on it then I get a request How do you want to open this file as it wants to look for an App or applicaiton. 2nd photo. My question here is am I missing something that should be there ? As wants the computer to find it ? Any help or information would be great. Thanks 73's WA8UNS