Welcome Aboard! A '99 is a bit older, so you may struggle at getting your answers.
I was able to locate a 2001 model online to look at (see link). So it may not be exactly like yours. This unit has a wet bay, if yours matches you need to turn the blue handled valves to the configuration you need/want. It looks like the city water hose connection is right below the upper valve. Can you read the labels associated with the valves? They will tell you which way to turn the valves to fill the tank, use the city water directly, sanitize and even winterize the plumbing system. The other typical fill option is a gravity fill port, but I am assuming you do not have this feature.
If you crawl under the MH you might be able to see the tanks. All of the FW tanks I have seen are an opaque white color. Black plastic for the grey and black water tanks. The black water tank is directly below the toilet. The grey water tank usually is next to it. Both will have a roof vent, directly above the tank. The FW tank, technically could be located anywhere. A good way to locate the FW tank is via the overflow/vent. It usually drops down next to tank. You will also have a FW tank low point drain. It will be very close to the tank. Fill the tank until the vent pours water out and you will have a good starting point to find it.
https://www.rvusa.com/2001-jayco-des...lass-c-2910423
Happy camping with your new to you MH
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