It’s not a dumb question Paul. I’ve not updated that tutorial in a little while. The Exclude Text Value from Symbol does not exist in the latest version of Sketch. You can now simply change the text in the Inspector panel. Much easier.

https://www.sketchapp.com/learn/documentation/symbols/editing-symbols/

Quick note: I’ll be moving all of my tutorials (and future tutorials) across to my new site http://kissmyui.com/ Come and join me there!