Manually (outside of RaspAP) configured VPN, how to have RaspAP funnel data through it?

[catfoobar]

This must be easy, but I'm new to Linux and networking. Since PIA isn't a standard hook in RaspAP, and, could not set it up manually with Openvpn even without RaspAP, I elected to manually install PIA with Wireguard. It works:

`eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.229 netmask 255.255.255.0 broadcast 192.168.1.255
ether b8:27:eb:4d:1c:42 txqueuelen 1000 (Ethernet)
RX packets 8826 bytes 3142268 (2.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4674 bytes 1580539 (1.5 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 37 bytes 4029 (3.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 37 bytes 4029 (3.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

pia: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1420
inet 10.21.225.206 netmask 255.255.255.255 destination 10.21.225.206
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
RX packets 3144 bytes 1845984 (1.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3188 bytes 643936 (628.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.3.141.1 netmask 255.255.255.0 broadcast 10.3.141.255
ether b8:27:eb:18:49:17 txqueuelen 1000 (Ethernet)
RX packets 3595 bytes 608044 (593.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3213 bytes 1785464 (1.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0`

But I don't know how to make RaspAP point to it. It must have something to do with the routing table configuration. Would LOVE to learn generally how connections are made internally, specifically in Linux.

Little help, please? : )

[catfoobar]

Update: RaspAP is actually routing through the VPN. The only issue is the phone I'm using to test/connect will only resolve DNS requests that are already loaded in the browser (resolved). Any attempt at doing a search in a blank browser tab hangs. Clearly a DNS resolve issue, but still not sure how to fix. Tried including the PIA DNS in the DHCP server settings, no joy. Tried including PIA DNS in advanced upstream DHCP window, still no joy. I don't understand enough to make things work...