Does anybody know how to remove this type of toilet seat cover. i have no access to the underneath of the toilet as it is fixed to the wall. i have tried to put a flat screw driver underneath and pop it out but it didnt work. I have also tried to lift the toilet seat off but couldn't move it.
What country are you in?
British ones are almost always bolted through the porcelain from below - plastic bolts & nuts [or sometimes metal on older units] underneath near the ends of your base strip.
Sometimes, but not always, with a screw head accessible from the top [to hold the bolt still as you undo from underneath, you cannot unfasten it with just the screw],
Old question I know, but my old toilet had two pins sticking up from the pan. These located into the hinge which gripped a groove on the aforementioned pins. To release, I simply pressed a button on the hinge. It was a little stiff and looked like it was just there for decoration. My button was in the center (on the back face of the hinge) and could only be accessed when the seat was down.
It's difficult to say from that image. But based on my own experience (UK, toilets which give no access to underneath): if you can't see an obvious way to disconnect it, you probably just have to pull upwards hard until it pops off.
You'll then be able to unscrew the bolts that hold a connector bar onto the toilet pan.