Could anyone computer smart help me out here? I need to take the case off my PC.

Basically what's happened here is I've fell back off my chair with the chair following with me, my foot stomped down on my headphone wire and the audiojack of that has snapped inside of the audio part on my PC - I've tried everything to try and get it out but nothing's worked so far So I'm suspecting that if I just open up the case and push it out from under it that it would pop out however I know absolutely nothing about computers, how would I go about getting it open? Aerocool Strike-X Xtreme USB 3.0 Gaming Case That's my case if any of you would be so kind to help me out because I really have no idea about how to go about any of this lol
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