So i got this recording interface and recorded some songs, but I can't figure out how to get the songs onto the flash card that came with it. And on top of that, I can't get my computer to register that there's a flash card being put in it. Anyone have any ideas on how I can fix this?

You, good sir, have not gone over to your friends house after a hard night of drinking to find 2 dudes passed out in the same room both holding their own flaccid cocks in hand, passed out, with porn on the tv.
I had the same problem with my DP-004. What you gotta do is go into the menu and click the "Wave" option. Basically the card is partitioned into 2 sections: One for the recording and one for the exporting of WAV files. What this does is copies your track over to the other partition, and THEN you'll be able to see your files and get them off the unit.