Hi BookJunkieLI, et al,
Paola is right - for the 302 main menu, select Settings, then Connectivity. Second from the bottom is an item USB Mode or similar, with an option that at present is likely to be marked "charge" or similar. Tap it and you should see a list of options drop down and then select the appropriate one.
According to the MobileRead Wiki, your device should read the microSD card okay - the 302 will accept up to 64 GB.
Have you tried looking at the Settings... About Device, to see what it thinks you have available? What of Settings... Maintenance... Format SD Card?
Cheers,
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