My memory card doesn't pop up in finder when I plug it in

Hi cat-hilary!

I have an article here that can provide you with some useful information regarding the SD card slot on your computer:

About the SD and SDXC card slot

http://support.apple.com/kb/HT3553

You will want to use that article to access information about which kind of cards can be used in that slot, and what to do if the card does not load as expected. Thanks for being a part of the Apple Support Communities!

Regards,

Braden

That link is too confusing, do you mind rephrasing it in your own words Braden? My card always use to work but suddenly isn't showing up on the computer.