Have you gone to Appearance>menus?
I’m sorry but as you are using a commercial theme, you need to seek support from the theme’s developer/vendor. We do not support commercial products here.
Thank you both!
Timfl, I did got to Appearance>Menus. Everything is there, I just can’t get it to actually appear on the blog.
Esmi, Thesis was telling me I need to use the WordPress system, but perhaps I misunderstood. I’ll look into it again.
If
Everything is there
then you need to keep looking at the menu setup. Did you name your menu? Is that the one that is activated? Sometimes, a theme author will declare a certain name that is required. keep at it!