cannot get the lid off roca cistern

[mrshcurtis]

hope someone can help me. it sounds stupid but i cannot get the lid off my roca cistern . it's only got one flush button (i've read about how to remove it when there are 2 buttons). thanks in advance!

 

[ChrisR]

Can only imagine the button surround turns?

 

[mrshcurtis]

that's exactly it! thank you so much- never would've thought to try that!