hate it wen that happens!

right at the bottem its plastic strip slid into another plastic strip kinda clips in carful screw driver wil do the job and for the top get a nose pliers and flat head screw driver theres 4 hooks u need to bend out then use pliers to push the little metal strip under itto un hook it then presto

for the lower front theres to big pins then that lower ajustable bit pulls off finding u have the 4 hooks under there again...