How do I open BeQuiet Pure Base 500 case?

Can anyone tell me how to access the motherboard in this particular PC in order to install additional RAM modules? I think I can’t post pictures but here is the description: Case: BeQuiet Pure Base 500 WITHOUT a side window, motherboard: Asus Prime B460M-A, and here is the link for pictures: https://www.sedatech.net/en/workstation-intel-core-i9-geforce-rtx-3060-12gb-14747?c=24 I literally do not know which screws to unscrew to open the case 🙁 Thanks a million in advance!