I couldn't find any info for a Samsung MX2830, are you sure it's not a M2830dw? The only manual I could find for a M2830dw was in Spanish which didn't do me any good.

I did find a manual for a M2835DW in English, it indicates that you should use labels that are made for use in a laser printer to survive the heat of the fuser. It also indicates that labels should be fed through the manual feeder, not the paper tray.