Is there a way to change the domain name of the main site. Just realized that the domain points to a login screen and the wordpress install is domain.com/blog.
If you mean automatically redirect “domain.com” to the blog, yes there is.
From the web admin interface, you should be able to set an app as the “Default”. Or you can use yunohost app makedefault from the command line.
how about a subdomain instead?
It’s not clear what you want. Can you describe precisely the behavior you would like to have for specific urls ?