Merick said:You click on them, there's a little path leading to it, but I can't imagine you only tried to click on it from the "back" since the "back" is facing the way you're unlikely to be coming from.
kuafu said:I had this problem before. Basically if your char is still far from the portal and you click on it, your char will walk towards it but stop in front of it. And then you can't seem to get in. What you need to do afterwards is to click the bottom of the portal to move your char about one more footstep closer to the portal, then you can click the portal and enter it. It's just a small map with a golden stash, like a small 1-level dungeon.