sanrr wrote:
I tried to add a device, the only new choice was the MF4350 FAX which is including in the scanner driver along with the tool box. I added the fax device, no tool box in MAC Doc.
To use the scanner, you do not add it to the Printers & Scanners preference pane. So as you have noticed, the scanner component does not appear in the Add window when you select to add a printer or scanner.
sanrr wrote:
Also, you said to select scan on the MF then send to computer, don't understand that. There is no send to computer choice on the MF in scan mode.
Sorry. Slightly wrong information. The MF devices that have an Ethernet port or WiFi support will show you more than one option when you press the Scan button on the MF. With your model only having USB, then pressing the Scan button will only show Scanning Mode, which is correct and what I should have said.
So with the MF set to Scanning Mode, open MF Toolbox and click on Scanner on the menu bar. You should see the MF4350 USB in a window similar to what I have shown below

Note that I think you will see MF4340-4350 USB. Which mentions the MF4350 as connected via USB, ensure this is selected (highlighted)
With the MF43xx USB connection selected, you can now click the Save button as shown below

This will display a new window letting you set your scanning preferences, similar to that show below.

If you can get this window to display, click the green Start button to test that you can scan a document. If this does not work, then please reply. If it does work, then you are ready to being scanning from the Mac.