1999 Ford Escort

Engine Mechanical problem
1999 Ford Escort 4 cyl Manual 84,000 miles

My car wont turn over. Every time I try it makes one click noise and that's it. I thought it was the battery, but I tried to jump it and it still didn't work. So then I popped the clutch and it started my car, but once I shut off the egnition it wouldn't start up again it just the same noise. I don't think it's the battery though because my interrior lights and headlights still work, and my wipers too, although they are really slow. So what do you think is wrong? I have absolutely no knowledge about fixing cars. This is so I can tell a friend to help me, because I'm broke and I'm hoping it's something cheap and simple.