Can I actually install AppCleaner on my computer for easy access.. or do I have to find a way to save this link If I have to do it again? Sorry, I'm an computer illiterate old guy.
Visit the link I provided and click on the right to download version 3.5. This will get you a zip file. Your browser will likely save the file to the Downloads folder. From your Dock, click on the Finder icon to launch it and you should see Downloads in the left sidebar. Click on that and you will see the
AppCleaner_3.5.zip file. Double click on it to extract the Zip file and you will now have an application called AppCleaner that will appear. Grab the newcomer and drag it to the Applications folder on the left sidebar.
AppCleaner is now "installed". To launch it, you can click on the Application folder in Finder and double-click on AppCleaner, or hit CMD+space to bring up Spotlight and start entering App and it will autocomplete to the application and then you hit Enter to launch, or you can click on the rocket ship (Launchpad) on your Dock and swipe around to find AppCleaner to launch it, or click on the Applications folder on your Dock all the way on the right and launch it from there.
Once launched, if you want to keep it always in your Dock, then right-click on the icon and choose the Keep in Dock option. I imagine, however, that this is a pretty infrequently used application and you likely don't want to use the Dock space to house it as opposed to other apps you are constantly launching.