Manual transmission issues? Shifting cables? I don't know?

Okay so my parents forced this car on to me about a year and a half ago, only two months of that working. When I had first got it I noticed it was slipping out of 5th or 3rd gears. One night I was speeding home and got off an interstate and my car shut off and my pedals were locked. I couldn't shift into any gears, had to engage clutch in order to even push it into a parking lot. I took it to a mechanic to figure out what the issue was, and they replaced the slave cylinder and clutch system. $1,300 later found out it was an issue with the transmission. I didn't have the money to fix it for awhile and about a year later - now I finally had the money to get a used transmission with 64k on it. I had it installed yesterday and it was fine but I noticed the shifter (i don't know what else to call it) seemed loose. Today I took it to get an oil change and they couldn't get the car to go into reverse, I tried, my friend tried - it just won't go into gear. I can't get into 5th either. I can't get into 3rd unless I'm pushing it into where 5th would be and 4th only goes into gear where reverse is. I'm so confused! It's a 2005 ford focus zx4 ST. 2.3/5spd.

Please help me, I've already spent like $2,300 on it and I haven't even drove it for more than two months. )

Sorry to say but you need to find a better mechanic

Pretty simple, take it back to the shop that did the repair.