If you're seeing this page, your server works!
In order to get a frontend to show here, you'll need to set up :pleroma, :frontends, primary and install your frontend of choice, in most cases this will just be:
# OTP
./bin/pleroma_ctl frontend install pleroma-fe --ref stable
# Source
mix pleroma.frontend install pleroma-fe --ref stable
## you can do the same thing for admin-fe if you so wish