Replaced the screen and it doesnt fit

Hi, i replaced my screen and it went perfectly (so thank you for that) but when it came to place the screen in it place, it didnt match perfectly. Do you know what i could do? The screen is not drasticly out, but it is out (and I think is riskier if it falls, because it will break eassier) and I dont know what to do? Should I push the frame back to it place (how and with which tool) brake something? Hahaha I dont know, any clue? Thanks