I need to fix the running water in our downstairs bathroom toilet. I've googled the subject and all the instructions start with:

Step 1: Remove the lid from the cistern.


But how do you get the bloody lid off the cistern?

It's not a regular lid, it's one of those ones with the 2 buttons on top like this.



I haven't tried forcing it for fear of causing damage.

Any help would be great. Cheers