Oldpeddaller

You're on the right (t)rack! The idea is that the separate plate fits in front of the seat stays and the front panel of the rack fits behind them, held together with the screws. You will probably need to bend the ends of the plate to fit around the front of the stays - that's how the short bolts supplied are long enough to fit. The problem with this fitting is firstly it's not very secure, plus the front of the rack can often f=slide forwards between the stays, also it can slip down and damage your paint. Instead, I cut a T-shaped bracket out of aluminium plate, with holes drilled to fit the rack at the top of the "T" and a larger hole at the bottom of the "T". This larger hole goes over the brake centre bolt in front of the brake bridge and is held in place by the brake nut and a washer. Or if you have rack bosses on your frame, simply use some metal strips to go between the bosses and the rack holes, one on each side. (Also works if you've got Canti or V brakes or no hole in the brake bridge). Alternatively, do the same but bolt the front ends of the strips to "P" clips around the stays, or to the seat binder bolt. With all of these ideas you'll need to bend the "T" bracket or metal strips to fit. It's just to anchor the front of the rack firmly so it doesn't move back and forwards, the legs should take most of the weight.