Notebooks = all Apple Portable computer support communities
Note: newest 12-inch MacBook is all-new.
If you have an older MacBook (not Pro or Air) there is a separate
section. If you have an vintage G3/G4 Portable iBook/PowerBook
they are also here under Notebooks. Each of the named sections
are generally labeled and accessible from the Welcome to ASC
discussions home page https://discussions.apple.com/welcome .
The MacBook Pro ASC area would befit the computer you're using.
MacBook Pro - Apple Support Community for MacBook Pro users.
Did the article linked in earlier reply help you with the memory card use?
A memory card would appear on the desktop similar to an external hard
disk drive, so items could be 'saved to' it in one of several ways. Or you
can drag & drop items on the icon of the memory card used thus.
The format may make a difference, in some cases, if the
cards are to be used for more than file transfer or storage.
This thread could be moved by a Host to another section, on request.
In any event...
Good luck & happy computing! 🙂