Ugh, that's such a pain when semesters get extended for seemingly arbitrary reasons. ;n; That's happened to me a couple of times too. But hey, its got to end some time, haha.
And there's always room for improvement for every artist, so you're not alone there. <3 But you have no idea how happy it makes me that you've decided to start posting again and found a little niche for you here. It's hard for artists to build up a comfortable place for themselves in a forum; I definitely appreciate and acknowledge that effort.
Yeah, you should just be able to go into your thread and click on the "Thread Tools" bar at the top then select edit title. To be honest though, it might be different for moderators since I see different thread commands than normal members. If that doesn't work, try just double clicking on the title and editing it while still on the A&D forum page. And if that doesn't work, than I can go in and do it for you.
The thing is, the ability to change a thread's title has to be set within a certain time frame because there isn't an "indefinitely" option in the admin panel. So there's a chance it might exclude old threads. Idk I'm not all that vB savvy but we'll make it happen, don't worry. :)