User manager with PPTP server

hi
i hava a network like this

Mikrotik (as gatway): 192.168.226.1
Lan: 192.168.226.0/24

mikrotik is connected to adsl modem and have internet

now i need to connect our client to internet by pptp service and manage by mikrotik user-manager

(no hotspot with user-manager)

but i dont know how do it?