This acticle discusses how to accept an invitation from your GM to join a game using EpicTable.
First a couple preliminaries.
When I use the word "game" in this article, I don't mean "D&D" or "Pathfinder", or the adventure I'm running (e.g., "Rise of the Runelords"). I mean my specific game, so "John's Thursday Night Rise of the Runelords Campaign". I probably wouldn't call it that, because there's not a global games catalog or anything like that--I'm just going to invite a couple friends, so I probably don't need to be that specific. I might just call it "Runelords", trusting that this will be identifiable enough for my players and I. (But who knows? If you're in tons of games...)
One more bit of preliminary info: Everyone, GM and players alike, downloads, installs, and runs EpicTable. It's the same application for everyone--there's no separate "player client" or anything like that. The only difference is the options available to licensed users vs. unlicensed users. (During the trial period, you're treated as if you were a licensed user.)
So, that out of the way... Your GM is going to email you or IM or otherwise send you an "invitation code". It's going to be a phrase, something like: "The all-seeing beholder zaps the sneaky elf.". You'll startup EpicTable, and on the Start Page, click "Accept Invitation" and enter that code. EpicTable will fetch the game, let's say it's "Thursday Night Runelords", and puts it in your games list. From then on, all you have to do to join the game is click on that game in your games list and click "Enter Game Room".
The following video demonstrates this in detail: EpicTable Tutorial Video - Accept an Invitation
This exchange of the invitation code is a one-time thing. After you've done that, both GM and players can get into the game simply by selecting the game in their list and clicking "Enter Game Room". There's no network to configure or server to select or anything like that. Once a game is in your games list, you have everything you need to join that game. EpicTable takes care of getting you connected.