Low coolant

What is your question?

I replace my radiator. And the thermostat. At firts when I did the radiator . I drove it and it overheated right at the corner.so I went and replace the thermostat.and no over heat or nothing.but I been putting antifrezze and it gows lows.it doesnt go all the way empty just on the low line.? I dnt kno what seems to be the problem