Configuring Time Capsule to distribute ISP given DHCP address

I am using tikona broadband internet and they usually have a 5 IP address restriction. I managed to by pass that by using a linksys router WRT120N . I setup the router to distribute IP addresses as 192.168.1.2-20.

However, when i am connecting my new time capsule, it seems to distribute IPs from DHCP as 10.x.x.2 onwards only.

How do i set up the time capsule so that it takes 10.x.x.x a its IP from DHCP and distributes over the network IPs as 192.168.1.X onwards?

That is also needed so that i will not have to login on each individual device with the ISP username and password on their website.