Revelations 2 How to play raid mod in coop online

PC. STEAM.

Somebody please explain in detail how do you play raid mode with your partner online? Once i clicked raid mode, i do not see any options to join a server or search for online raid game modes!

I found an explanation how to start raid, but it DOES NOT WORK:

"to play online after downloading the latest update, start Raid Mode and head to the blue door. There you can invite a partner or seek one through matchmaking"

WTF should i suppose to hit on my PC KEYBOARD to play RAID online after getting near that blue door? There is no interaction message near that blue door!

Maybe watch some videos on Youtube? I played Raid Mode online a lot on PS3 and I used the blue door... Granted it took a while to find a match sometimes, but that is how it's done. :/