How do I get a newly installed Cannonscan8800F Scanner to show up in " IMPORT "
Also, did you install TWAIN plug-in? You must do that, if you haven't. Go to applications>adobe photoshop elements 11>support files>optional plugins and move the ImportModules folder from there to applications>adobe photoshop elements 11>support files>plugins.
What installing the twain plug-in, you mean? Go to your applications folder. Find the Adobe Photoshop Elements 11 folder. Look in there for a folder called support files, then for a folder called optional plugins. In the Optional Plugins folder, there should be a folder called ImportModules. Just drag that from the Optional Plugins folder to the regular Plugins folder.
This will be infinitely easier to do if you put your applications folder window into list view, not the default icon view. To do that, click this button at the top of the window: