Executing a bash script at the startup of the desktop

When the desktop starts, I would like to have a bash script I wrote, start, I am not sure how to do this, in my previous linux distro, Ubuntu Mate, the was an application launcher. On you system, under Settings, there is a startup application dialog box, but the add button will not add, or respond. I was thinking this is where I should add my bash script? Any help here would be greatly appreciated.