First make sure that you have connected your device to the computer with a USB cable. Dazzboard doesn't currently support other connection types. If you are using a mobile phone make sure that you have chosen the correct connection mode; supported modes are mass storage, media transfer, ActiveSync and PictBridge.
Mobile phone vendors uses various names for these modes, here is list of known ones:
Media transfer [preferred]Android – When the phone is connected to the computer with a USB cable you will get a "USB connected" notification in the top toolbar. Click it and you should get a confirmation box where you can select "Mount" or "Don't mount", select "Mount".
Palm Pre – Connect your device in Media Sync mode to get best support.
Blackberry Storm – Enable the mass storage mode. On your phone first go to OPTIONS/MEDIA CARD/make sure that MASS STORAGE mode is enabled.
Digital cameras – Connect your digital camera to PC in mass storage mode. PictBridge and PTP (Picture Transfer Protocol) modes are not supported. If you cannot connect your camera in any other mode than PictBridge or PTP you can take the memory card out of the camera and connect it to a card reader.