Firewall/NAT

I have a monowall router with lan and opt1 interface.
Lan is 192.168.0.1 and opt1 is 10.20.2.108 (works in bss mode and connects to wireless network)
I have a static route in monowall with interface opt1 and 10.0.0.0/8 with gateway 10.20.2.1 so I can reach other computers in that wireless network, and they all ping fine from monowall.
Next I connect PC by lan to monowall with ip 192.168.0.2 and gateway 192.168.0.1, I added route 10.0.0.0/8 with gateway 192.168.0.1 but I still can't reach no other ip than 10.20.2.108 from that PC.
Do I need to setup any kind of nat?
How to solve this problem please.

Here is the graphical scheme for better understanding,
So the problem is that the PC behind monowall can't reach anything beyond 10.20.2.108,
while monowall pings everything in 10.x.x.x range.

Sounds like m0n0wall is setup fine. Are the routes on 10.20.2.1 setup properly to direct 192.168.0.0/24 to m0n0wall?

I found the solution, everything was fine after I added outbound NAT routing 192.0.0.0/8 to 10.0.0.0/8.