Thanks to everyone for your input. At least I know that's where the phone jack should be. I took another picture which is much better: **broken link removed**.
I really don't know what I should get. The ATT technician is coming next week so I guess he can do it. But since I know that ATT will overcharge me for that, can I just buy whatever it is I need to buy. I mean, I can fix my own stuff but I'm not an electrician and I don't know anything about phone connections, I just want my DSL.