Need help Fast

Well, I am actually on here for my friends 2000 Tundra, he killed the battery and tried to jump it. Unfortunately it wass kinda dark and he got the wires backwards, yep big sparks but it blew the main 120Amp fuse. I can not figure out how to change this thing, It wont pull out and I even removed the bolt under the wire thinking that was holding it. It still wont pull though. Any Ideas? It is dark and I just cant find the trick to remove it. Any ideas would be greatly appreciated.

Thanks

There's a clip on the fusebox that will let you slide that main section out, then there's another screw on other side of fuse

Thank you for the help, I did end up finding that second screw and replaced the fuse, $2.50 at Advance, also had two other blown fuses, he got real lucky nothing else was lost. Just a good education to be careful next time.

Thanks again