If you’re referring to the GF UI (what you see at app.glowforge.com) that’s only really intended to run a design that you create in another software package.
CNC machines (lasers like this are one kind of CNC) usually have 2 software applications they use - a CAD (computer aided design) and a CAM (computer assisted manufacturing) application. The GFUI is the CAM application. You need a CAD application for real design.
Check out Inkscape (free), Fusion 360 (free to small businesses & students) or Adobe Illustrator or Affinity (paid applications).
There are tutorials here in the forum for how to use these for designing projects for the GF laser.
Very nice first engrave though.