1. Go to Listing Fields > Add "Rates" (or any name you want ex "Hourly Rate") Field type = Price / Save
* You could even create a listing group called rates or similar (add that group to your submit form) then add several fields to it like hourly rate, 4 hourly rate nightly rate etc etc
2. Go to category > Select Build forms > Submit form
3. Drag the "Rates" Listing Field from the right to anywhere on the left in the position that you would like to have it show on the form.
Save / hard refresh then go to you listing and you will be able to add your hourly rate from there.