Locate wall studs with a stud finder and mark their centers
Measure and mark the desired cupboard height and position
Draw a level reference line for the top or bottom edge
Check the cupboard weight and use appropriate wall anchors if needed
Remove cupboard doors and shelves if possible to reduce weight
Hold the cupboard in place or use a temporary support ledger board
Drill pilot holes through the cupboard mounting rail or back
Align the cupboard with the marked stud centers
Drive screws through the cupboard into the studs
Use wall anchors for any mounting points that do not hit studs
Check the cupboard with a level before fully tightening screws
Tighten all screws securely
Reinstall doors and shelves
Test the cupboard for stability before loading it