I don't have mine with me to check, but I don't seem to recall anything unusual like that.

Perhaps you need to push it in further... I don't recall if it was this tab or a different device that I needed to push the card in with my finger nail to get it seated. It shouldn't take a lot of force, but it may take pushing deeper than you can with your finger tip.

 

Make sure you're putting it in the right direction. It should snap into place to lock, as Little Darwin say, you may need to push it with your finger nail. I just checked mine by taking it out and put it back in.

 

Do you guys know what class card is needed.

 

a class 4 card should work just fine..