Currently this is not present in the MFNE User Interface. To use Neogitate based Authentication you need to create a MAPI Profile for this purpose.
1) Create a MAPI Profile and connect to Exchange using the Negotiate Authentication
2) Add the following lines to your Global Default Settings
[Exchange]RPCUseAdminMapiProfile=1
[Exchange]RPCAdminMapiProfile=profile name
If the profile name has spaces you will need quotes around the profile name.