Again, I don't have a 902. But on my Pocketbook 360, the card shows up under Books in the menu. I've named the card so I know which file it is, and also there is a little icon that tells me whether it is on the SD card or in the main memory. My IQ is similar, the library is set to folder mode and shows the main memory as one folder, and the card as another. For the 360, the gold teeth go in first and away from the screen. For the IQ, it's teeth first and towards the screen. Both click into place.
If the PC can see the card and it formats, it would seem the card is good. And if it's clicking into place (without being forced, of course), it seems it's being inserted properly. Maybe there's something else in the menu options? I think the IQ had to be set to folders in the library menu before I could see the card on the device--I could always see it from the PC. Maybe try (gently) turning the card over? Teeth first and downward? Don't force it, but see if it goes in that way.
Are you in the US? Maybe contact customer service (after the weekend, of course) at (816)0510-1317 or 877-326-0196 or
service@pocketbook-usa.com