opening a file

I downloaded unetbootin to create a iso to install on another computer. I dont know which app to use to open this app. Can anyone help. Yes I’m a newbie to Linux.:s

Right-click goto properties and set the executable under permissions. Then the app should run with a click. At least under netrunner

Just don’t use unetbootin to create a Netrunner Rolling install media, It needs to be read as a iso9660 files system to work right (External DVD device)