Transmission lost fifth gear?

I just bought this car a couple weeks ago and I wasn't aware of how you are supposed to lift the shift casing to put it into reverse and I don't know if I broke it or if it was already broken. But yeah, reverses in the spot at first and then reverse first second third fourth all work correctly but no 5th gear. Was originally thinking maybe the little piece at the top of transmission under shifter, but after looking online I'm not sure haven't tried anything yet. But where should I begin, or should I just take it to a shop on the Oregon coast and have no clue how much it would be to see mechanic around here. But am rather limited on funds.