export / import csv

I have redesigned a website that has WP-CRM installed. I have exported all the users as a csv, and installed WP-CRM onto the new site, but there doesn’t seem to be any way to import the users back into WP-CRM on the new site. There are over 900 users so I don’t want to do it manually. Have I missed something? Or is there an add-on / plug-in that will allow me to do that? Please can I get some guidance on best way to proceed. How did you manage it @robweltman ?