PPTP server, WAN and VLAN's communication

VlanFunBox.png
Hello,
I have an internet fiber-optic cable for Funbox 3.0.
Mikrotik and Komputer are connected to FunBox.
Someone (to the Internet) is port 1723 PPTP server

And now I do not know how to do the routing so after connecting to PPTP
so that I can see the whole building 192.168.100.0/24, vlan10 and vlan20

Thank you in advance for your help
PS.The scheme is simplified to make it clearer