Help in setting up a 2nd access point

I currently have a Fritzbox 7390 as our main router/wireless access point, but down one end of the house, wifi is dodgy at best.

I have a spare belkin f5d7644-4 wireless g router sitting around. Is it possible to use this as an extender?

The house is wired cat5e so I can easily connect the belkin to a spare wired port on my switch, but just not sure how to set it up, or if it's even possible, so that it communicates with the Fritzbox and the fibre connection?

I've tried google, but could only see things on port forwarding, perhaps my googlefu is weak.

Any plain English help would be appreciated

Cheers

Sen