The easiest way to find the server in the browser is to remote connect to the server using this IP.
Mods are required to connect. There are a million ways to get your mods, take your pick.
There is a PlayWithSix collection that is actively synced to the server. If you keep up to date with this collection then you'll always be good to go.

Some of you are still using the S77th collection which will work for now and is a smaller download, however it's in limbo until I get my ducks in a row.

Common problems with PwS stem from the auto login failing. Ensure that you're logged in before syncing. If you get 'connection failed' on the bottom right then simply log out and in again.
Another issue is after exiting PwS either by a crash or normally exiting, it won't launch again. You need to close the PwS service in the task manager before restarting it.