Look at the flushing mechanism, you will probably see a blue lever, once moved that you should be able to move the top part of the mechanism up to be at a level close to the bottom of the cistern lid. Bring the lever back in place and close the lid, screw back the buttons, if you see they are still not level, go back to the lever and do your final adjustement
The botton should adjust up and down by tuning it left or right
There are some dual flush cisterns where you have to depress one button to reveal a cavity in the second button. Put a screwdriver in that cavity to left out the second button, then release the first button and pry that out.
Underneath the buttons is a screw which must be unscrewed to release the cistern lid.
Not sure if this will apply to you... but if not, good luck anyway.
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There is a video on you tube called "Happy D. Installation and Service Instructions" that explains it perfectly
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