Clutch issues put it in first and it won't go?

I just replaced the cluch in my 2013 kia soul 6 speed. When its first cranked it will go into gear fine and change gears. After driving it for less than 30 min, I will like stop at a red light or stop sign and put it in neutral, when the light changes or I try to start to go I press in the cluch, put it in first and it won't go anywhere. Then I can turn the car off for a while and it will go into gear for only for a few minutes and then its like its not in gear anymore.