How to add static routs for subnets behind the PfSense LAN

[Snailkhan]

Hi,
There lies some network subents which are at the LAN Side of my pfsense.
I do not see any routes to them in my pfsense for obivous reasons as they are not directly connected/defined on my pfsense.
hence i cannot access them. How do i add a static route to those subents ?
they should be accessible via the LAN Interface.