I have a Zyxel VMG3925 B10B router and I wish to install a VPN

Hi First post so forgive an old man .I would like to install a vpn on my router instead of all the individual stuff.I run an iMac ,chromebook ,I have android tv and a zoomtak streaming box plus two smart phones .My son (much smarter than me but very busy) told me my box is set up for it but I cannot see where the vpn wizard is ! I have googled but cannot find my model and the ones I have found are not the same An idea of where to find it any any other help would be greatly appreciated

#CPE_October