Hi Solbore, welcome to MobileRead!
The Pocketbook 902 has this kind of lock/push mechanism you described, too. You have to push the card really deep into the device (some of us here do it with the help of a little coin) and then it will be locked and stay there. Please, try it once more, it's not trivial and you're not the first one experiencing problems with inserting the sd card.
But if you really won't manage to insert the card: maybe your card slot is defective and you need to give back the reader.
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