First, why can't I select any Flashpoints? I'm level 21 and have three in my mission log. Do I have to be in a particular place? I was under the impression that you can get automatically transported to the flashpoints when you get a group.
I think I know the answer to your first question. You can use the group finder anywhere and it will transport you to the quest. The reason that you can not select any flashpoints is actually that you have them in your mission log. You can confirm this by abandoning one of them and seeing if that one becomes available through the group finder. If that works abandon the other two and queue randomly to get the daily reward. Hope this helps. I ran into the same issue on the pts and was unable to figure out the solution in time to get the titles.