@stefan based on your feedback I have made an update to the documentation on the following link and added the password for the WiFi Hotspot as part of it. We will also add it to the Mobile App too.:
However, I feel that the documentation for the setup process can be written in a better way then it is right now. We plan to launch a major UX update to the Bolt Mobile App in 2 weeks time. I shall re-write the setup process after the update and keep your suggestions in mind.