Blowing up the picture shows two hex fittings, one on the city water hookup, and one on the hose side, use two wrenches ( the correct size is preferred to an adjustable) and loosen the fitting, remove it, replace the hose, (personally I would change the fitting as well if you can get one handily) and re-install.
On metal to metal connections like that I usually use 2-3 turns of white plumbers tape to ensure a good seal
joe
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