First "warning" do not put a glass hold on the home corner of the bed you take the chance of damaging your extruder. Add 3 to the corners of the bed other than the home corner. Tighten down to where it just touches the glass then back the bolts off a 1/4 turn, this will allow for proper glass expansion. 6 M3x18mm bolts will be needed. Note: by default your home corner is the front left. Enjoy