How to open Dell dimension 3100 case?

[jessica_jung34]

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Hi ! Can someone teach me how to open our system unit case for Dell dimension 3100 ?
I think that I'm sliding it the wrong way since this case has no screws.
Below are the pictures of the case and would appreciate if you can also put instructions and arrow directions. TYIA

[jessica_jung34]

up............... anyone?

[alwaysdrunk]

kanang first circle sa taas e push forward. kanang ikaduha na circle wa nay labot pag open sa case.sa pag taud nag videocard.