How to setup my Android wifi config for vpn sharing using astrill?

https://wiki.astrill.com/Astrill_Setup_Manual:Enable_VPN_Sharing I am trying to enable VPN sharing from my computer to my Android device. I got to the step where I change the IP Settings from DHCP to Static. I entered the IP address in Gateway, DNS1 and DNS2 as instructed. However, I am unable to save because the IP address field is missing. Does anyone know what to enter and where to find it?