There is an option to edit your topic on the right side, in the grey bar with red font it syas “Edit Topic” I had a hard time finding it too.
Also, is normal for betas to go open just before launch to test capability servers. If so, my wait for a taste of D3 will be over. I really hope they go open, even if its only for a few days.]
While I was doing some research about the topic you posted, it seems more of an error than a planned. I’ll wait and see.