I can't work out how to get the seat off my bike? it is a sector i knwo i selected a zing 125 but i had to

NOPE, WRONG! Thought mine was the 2 chrome side boltnuts on the rack, but no. Finally did mine today after some head scratching. Look underneath rear of seat to underside of mudguard. there are 4 10mm? nuts on bolts, well 3 on mine! 2 are visible, the other 2 just feel for them. They secure the seat. Using a small ratcet socket, with 2 inch extender, 10mm? socket, take nuts right off, gently lift rear end of seat and move it towards tail light. (Seems its got something that holds it inplace at tank end, but frees with the action I said in last sentence).
One of the damper rubbers came off, but its easy to put back in. Its a struggle to re-aline the seat securing bolts when doing it back up! Make sure the tank end is seated correctly (fairly obvious) then push seat hard to tank whilst guiding seat bolts to holes.After doing up, check that tank end does not lift....though I'm not sure that this last check is needed.

Some scooters seat latches operate with the ignition key switch.
Turn it left and right as you lift the seat.
Sometime you have to push down on the seat while you turn the key
Some have a key right on the left side of the bike for the seat latch.

If you have no key, you can pull off the rear rack and then take off the plastics above the tail light.
Once that plastic is off you can reach the latch with a screwdriver or needle nose pliers.