Replacing toilet seat
Replacement toilet seats will fit most standard toilets. However, unless you buy a replacement seat from the same manufacturer as the toilet bowl, there is no guarantee that the seat will fit.
To remove the existing toilet seat
To remove the seat, lift the cover up using a flat screwdriver to expose the retaining screw. Simply unscrew the screws and the whole seat lifts off the mounting holes.
To fasten a new seat to the toilet pan
The two hinges must be pushed into the two holes in the seat and lid and must face the way shown. If you put these on the wrong way round it is almost impossible to get to the screws to tighten them. The covers must also be in place as shown before fastening to the toilet.