it would help if you can provide more details. If you have two routers seperating two subnets, then you should have three subnets in total. For example, one subnet on each side of each router and a subnet between the routers.
For you to be able to route packets between the two "exterior" subnets each router needs to know about those remote subnets.
If you want to upload a diagram with IP information, that would be helpful.