can anyone help me with tring to install my new shelf speakers. i wanted to know what screws to use to hang it up.

Just trial and error. that shelf is either wood or plastic so get some screws that are meant for wood to metal fastening. Screw it in from the back and make sure it doesn't fall.. Or check You-Tube there are alot of useful videos on there, I'm sure someone has a video of it being done.