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Flow's U-Click cable router is a special case.

For some unknown reason Flow's router only gives out one DHCP IP address.
This means that only one computer, or router, or IP phone will work at a time.
Unlike other services, you MUST use a router if you need to connect more than one device to your U-Click internet service.
A regular switch will not work.

Many people have reported problems setting up wireless with U-Click routers.

Here is the trick:

Flow's router will not give a second IP address to another device untill you reset it.
You need to unplug it before connecting your wireless router.
It also has a battery pack which prevents it from resetting when you unplug it. You also need to remove the battery.

Once you have connected your Flow router to your Wireless router's Internet Port, and your computer to your Wireless Router's LAN port,
you can replace the battery in your Flow router and plug it in. Then plug in your Wireless router. Then switch on your computer.
You should already be connected to the internet at this point.
Now you can login to your router and finish configuring settings.
In this case the only settings you need to change on your wireless router are the wireless settings (password etc.).

UPDATE:

The new black "Arris" U-Click cable routers do not have a battery compartment.
To reset these you only need to unplug them for a few seconds.