Click on the following link to subscribe to the portal.

You must have Osiris installed to join a portal!
If you haven't installed Osiris yet, you can get it from official site.

osiris://|portal|00000001F48618F544C64235055817D3FB234EA8F9A88965|name=General+English+Osiris+Portal|description=This+is+a+general+Osiris+portal+for+the+English+speaking+community+that+can+serve+as+a+first+portal+for+people+new+to+the+Osiris+project%21|user=01000002D98F081EE1CC68669E78D45B694F726D3967240A|