I'm confused a bit by the wording. I assume you mean working it, and no you do not have to burn candles on the jar. You can just shake the jar, give it attention, reinforce petitions, just work with it. You could also boil the jar in some hot water to "heat" it up.
And, yes. You can definitely use a honey jar for more than love. It can be for any type of sweetening and even healing.