It's hard to see in the picture the condition of the tabs that snap into the shifting fork of the tranny. If the end tab didn't break off ( so it could jump off the tranny fork) then the cable probably snapped into. Feel blessed if that's the only problem. Also, Take the pulley off and clean and lube the pivot bolt and cable guide no matter what happened to the cable.
1. pull up carpet on the tunnel and the center storage box. open the 2 inspection doors
2. take off the wood pedal board.
3. adopt a skilled monkey. although not required for small skinny guys, i pull the steering wheel to let me climb into pedal area.
4. unclip the cable at the end of the pedal
5. since it's broken, carefully start working the cable out from both ends. if you see the broken end, go to Harbor Freight and get a pair of cable cutters..not wire cutters..and cut the frayed end off. it's no fun getting the cable stuck inside the tube. spin the cable while pulling it out seems to help. spray oil up into the tube also.
6. study the pictues here and the haynes book to see how it goes back together.
like the book says, reverse the take apart is how it goes together.
If you need a cable, the usual sources online. you might call Zims in Bedford, too.
7. if the clutch adjustment was working ok before, just snug up the cable, test the shifting, and keep working on the tension until it works like befiore.
8. Find a Dr Evil thread. in his signature used to be a 40 page pdf on clutch adjustment covering it all.
if you get stuck post pictures. I know more experienced mechanics will pop in with more help if needed.
Happy teenering
PS. It's easy to cross the clutch cable over the accelerator cable inside the tunne. Use a mirrow and light or a phone picture to look inside and be sure they are not crossed. If so, you push on the clutch pedal and the car accelerates.