Can't get into 2nd or 5th gear?

I have saab 900 turbo 1992. I accidentally crunched the gears and now I can't get into 2nd or 5th gear. I push the clutch down but I can shift it because the gear stick is stuck or something. I think I might have to double clutch now but I have no idea how to do it any ideas?
Update: I can sometimes get into 2nd or 5th gear. Just sometimes I can't and I have to go from 1st to 3rd
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