How do I change base URL in Projects
How do I ensure that the change is done on my C5 account?
It doesn't matter. it will just list any instance of the same database that you connect to the community with there. no big deal which one is called which.
if you mean how do you make your own website resolve to a specific URL when there are multiple domains pointing at it, read this how-to:
Now that I have a permanent domain, how do I get my project page to list the domain name with my project as opposed to this ugly temporary url?
I know it doesn't affect my website, I just want to keep my project page organized and looking tidy.