To go from patternz.bubbleapps.io to amazing.myowndomain.com, we need to configure dns records.
You should have received the records to add in the email:
Here is a helpful link to bubble.io doc: https://manual.bubble.io/application-settings/custom-domain-ssl
Here is a helpful video by bubble.
It covers GoDaddy/Google DNS/Namecheap if you are using those providers. If not, the material is still helpful.
We have already done the bubble side and shared the right records/urls to add so you don't need to do anything in the bubble editor
https://www.youtube.com/watch?v=vGk6nfq41L4
We have probably built something similar before, let us help you