You press right trigger open up a list of tabs. One says squad your fireteam, clan your entire clan on warframe, region fellow gamers in your time zones kind of a group forum and a recruiter thing, and recruiting everyone across the board on warframe. To answer your question you just make a post in one of the above tabs and will be asked in a private tab for an inv from a specific gamer that saw your post and clicked your name to start a conversation.

This sounds pretty simple yet effective. I still don't understand how there is no team finder ability in game for Destiny. It's 2016 and I have to go on a separate website to find people to play with? Unreal.

Yeah I know it seems odd at this point of the game's life not having that system. That was why I was wondering why not have bungie do something similar to warframe's form of interactions.