I have an NFS server on my network, and I would like to access it using the "Files" application on Ubuntu. I go to "Other Locations" and I can see my server:

But when I click on "WhiteAndNerdy (nfs)", I get this error:

I tried asking this question on AskUbuntu, but the answer I got was to create the mount point by right-clicking on the server and choosing "Preferences". There is no "Preferences" on the right-click menu:

What can I do?