my cases side panel's wont remove

[beastmodegaming54321]

Hello

I am swapping cases and im upgrading my PC but i cant unscrew the HDD becauseone panel of the pc wont come off

case-https://support.hp.com/us-en/document/c02481302
I cant find any screws to remove the other side panel please help as without this i cant complete my build.

 

[racksmith101]

Post some pics (use a free pic hosting site and put links here) so we can see the back of the case.