How to disconnect negative battery cable on Hyundai sonata 2017 (base)?

My and only the right low beam headlight is out and this only happened on 10/29/17 after I gave my friend a jumper boost. It was the middle of a tropical storm in NY then. So I'm thinking there may be a electrical issue and I don't currently have tools but I wanted to disconnect the negative battery cable... show more My and only the right low beam headlight is out and this only happened on 10/29/17 after I gave my friend a jumper boost. It was the middle of a tropical storm in NY then. So I'm thinking there may be a electrical issue and I don't currently have tools but I wanted to disconnect the negative battery cable before I reassemble the low beam light? I'm just having trouble figuring this out since I'm still an amateur diy guy. Any help?
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