low memory pops up what to do

Thanks for posting in the Apple Support Communities TeriNWA,

If you're seeing a message that your Mac is low on memory, with the recommendation of closing apps, save your progress in any open apps, than quit apps you aren't using, with the following steps:

• To quit an app, choose App Name > Quit App in the menu bar. For example, choose Preview > Quit Preview (or press the keyboard shortcut Command-Q).

Keep in mind that if you click the Close button  in the top-left corner of an app’s window, the window closes, but the app remains open (a small dot below the app’s icon in the Dock indicates that the app’s open).

Quit apps on Mac

Cheers!