Ask as many questions as needed if you still need help 🖖
Discussion
1) How do I change my banner image using my phone?
2) Is there an option to make my account private?
3) How can I become a Damus contributor?
1) upload the image you want to have as your banner to a service like nostr.build, copy the url and paste it on the corresponding profile section.
2) I don’t think so
3) I would start here: https://github.com/damus-io/damus. You can also get in touch with Damus devs, like #[4]