Yes, I'm new to poly - just a few years in - and there are situations where I just shake my head, and say that's a new one.
The forum is searchable by Google so if you give out too much specific information, people could possibly figure out who you and your girlfriend are. If you keep personal and location data generic, that is one way to guard your identity. Also don't use a screen name you use anywhere else.
However, Private Messages are not searchable. (Dear forum friends, if this is not true, please jump in now and correct me!)
You are welcome to PM me if you like. I don't know what help I may be but I'm happy to listen.
Also, if you find someone on the forum whose posts resonate with you, many people here are open to getting a PM from others. You can PM people without interacting with them first - although that is helpful.