There seems to be no "import" function under plug-ins.
I'm not sure what that means, but to scan into the PSE editor you will need to install the twain plugin. Do this by moving the ImportModules folder from Applications>Adobe Photoshop Elements 11>Support Files>Optional Plug-ins into Applications>Adobe Photoshop Elements 11>Support Files>Plug-ins.
Thank you. Still not seeing it under File - Import on PSE
Have you restarted both your computer and PSE? Does the scanner work in Preview? Are you sure you have the latest driver for it?