Yes try to pry there and see if it pops open. If not I would put the screws on the top and bottom as mentioned before.
This is a replacement window so it should be the same size as an existing window frame right? Why are you building a new frame? Also the screw gets screwed into vinyl then the existing wood frame. Not the other way around or then you’ll just have a sharp screw sticking out of the vinyl. The wood frame is supposed to hold the window not the vinyl.
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