Lets start with setting the cabinet height by adding the plastic feet.
Grab the loose adjustable cabinet feet and insert into the base already installed underneath the cabinet. Using your Sliding combination square set to 144mm in height set all feet to this height
A quick side note : some cabinets, but not all, may have a protective plastic coating that can be peeled off after installation and before handles are installed.
Almost all myDIY cabinets also feature a rear 16mm void section that can be removed if you have any wall obstacles or cables you wish to run behind unseen.
NOTE : Upper cabinets will have brown stoppers which denotes the top of the cabinet, remove these and turn upside down for installation
