I thought the OP was in reference to the server side. Apologies. It seems you have everything correctly set on that matter.
Regarding the specific issue you can leave it manual. What you must do is create the number of profiles you need in KODI itself. Then they will be presented after each restart/power on.
Furthermore (and I don't know your actual awareness), "Emby Connect" would need you to register with Emby Media, on each user you would like. I personally don't use it as it involves PIN codes cross-checkings. And, in my opinion, is best suited for external streaming (i.e. If you want to access your home server while you are away and you don't remeber the external WAN IP).
Btw, don't forget to configure everything with each profile you go on creating. I personally don't use that scheme because I only need 1 user per machine (3 machines 3 users). But to the best of my knowledge what I've said is the correct way to go if you would like the opposite I have (3 users 1 machine).
Report back if solved please.
Edited by djhifi, 07 March 2017 - 05:02 PM.