Sometimes getting a quick visual helps a lot. Please see below for videos demonstrating how to attach blades on Preserve razors.
Attaching your Blades
PRESERVE SHAVE 5 or POPi SHAVE 5
PRESERVE SHAVE 3 or PRESERVE TRIPLE RAZOR
Trouble Shooting the connection:
If the arms arms are not nested under the clips on the back of the cartridge, the cartridge will not stay properly attached.
Use fingers to move the arms out.
Properly connected