beerminer Right click the file, choose Properties, then select the Permissions tab, and at the bottom, check the box that says 'allow executing file as program.' You should then be able to double click the file to execute it.
Piyush_Kumar beerminer I did that and it's working now but what about it's icon. It still has the gear icon.
algent Piyush_Kumar You download an icon from internet. Save that appimage file somewhere in your home folder and then install menulibre. With menulibre you can set an icon for this app and you can customize other icons for existing packages as well.
dbarron Technically, you don't even install appimage containers, they are stand-alone packages that contains everything needed to run. You just run it.