I "had" (was requested) to do this too but for different reasons -- so we could figure out when I need to reach out to someone. I didn't know what to do with it either. In the end I think I put something like

0. Numb
1. Hyperelevated (manic)
2. Elevated
3. Happy
4. Content
5. Baseline mood, nondescript
6. Destabilized, anxious
7. Depressed, world-is-gray, mildly self-destructive
8. Meltdown, intensely self-destructive
9. The world is ending, suicidal
10. In the process of making a plan I intend to carry out

Hope that helps. I was super stressed out about it too but my therapist said there was no right or wrong way to do it and she didn't intend for it to be so stressful, so don't worry too much, I'm sure your therapist would say the same for you.