Beginners help!

Hi guys. I’m a total newbie to the BB and the BB manager. I can’t seem to get the files off my SD card and onto the BB manager. Whenever I select the SD card it says there’s no pbf files. I’ve watched the videos and read the instructions but I’m obviously not getting it haha. Also when I’ve tried to save a project and then open it in the user lib file it says it’s empty. Any help would be greatly appreciated. The more laymans terms and less computer speak the better hahahaha.

Thanks guys
Jonny