put starter wont go into gear fiat bravo?

i have just put in the starter in my fiat bravo and it actually
starts(again cheers Ian without you help i be screwed) but now
the car will not go in to gear non of them, and when i turn it off and put in gear and start the engine it will not start, any ideas?
so to break it down , took out old starter the cover over the bar that rotates was broken off, put on new starter car starts however now does not get into gear any answers cheers.....