How do I quit?

Hello, I got my first job ever, at a warehouse and I honestly really enjoy it, I like being on my feet, hands on, and really like my coworkers, I've only been there for a little over a week. However I had a family emergency that's quite, urgent. The person wants me to watch him, he believes my presence will, prevent him from making a life altering decision, if you know what I mean. This experience is pretty taxing mentally, and I honestly dont think I can do both at the moment, my mental health and family come first, how do I quit? I work via a hiring agency.

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