The AI section builder makes a new section from a short description. Open AI section builder in the Sections sidebar, write what you want, choose a mode and send it.
These are the estimates the app shows next to each mode, so check them there. Bigger jobs use more tokens. Everything you do yourself, such as browsing and copying free sections, stays free.
You should see your section appear in the live preview, and your token balance go down.
If it did not work: if you run out of tokens, the builder cannot start a new generation, but browsing and free copying still work. Try Fast to stretch what you have left.
Next: Themes