Ford Flex 2018 Owner's Manual page 223

Driving Hints
E142666
To install the floor mats, position the floor
mat eyelet over the retention post and
press down to lock in position.
To remove the floor mat, reverse the
installation procedure.
Note: Regularly check the floor mats to
make sure they are secure.
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Flex (TP3) , enUSA, Edition date: 201801, Second Printing