You will need to determine the model of your router and get download the manual

I just signed up and have yet to receive my equipment but from what I understand they provide a separate modem and wireless router device.  I am in Ontario, not sure if things are different elsewhere.  If it was a combo modem/router device and you wanted to use your own router, then you would configure bridge mode.  In the case of the separate modem and wireless router devices that Koodo provides, you would just replace the wireless router with your own, there is no need to configure bridge mode.  Someone correct me if I am wrong.

Just received the DM1000 cable modem. There is no instruction on how to login into the modem.

The manual can be found here.

Looks like the default ip is 192.168.100.1 though, so it should work with the default settings of most home routers even without bridging it.