Multiple subnets IPv6

My network has 2 subnets, both of them currently support IPv4,but I’m having troubles configuring IPv6. I have divided my address space, but I don’t know how to tie each subnet to their routers, since IPv6 has no default router.
Comments is appreciated.

Does your ISP give you a larger address space than a single /64 subnet? (

Yes, my subnet is /62.