Aside from the mealybugs, your jade looks etiolated -- which means it needs more sun (closer to direct sun).
As for watering, it's in a pretty small pot and I'm guessing it had a lot more leaves at one point? If so, I'd guess the root system is pretty extensive. When you water, you want to water a LOT at once, until water is pouring out the drain hole in the bottom....not a "little bit often", but a lot at one time. Then, let it go dry before you water it again. In my house, which is a pretty constant 75 degrees or so, I water my jades maybe once every 10 days and that's with completely bark-based soil with a lot of air pockets. If I used regular potting soil (like I have with some of my other houseplants), I often go a whole month before watering, especially if the central air is running in the summer.
I'd get rid of the mealybugs first.
Later, once everything is eradicated, I'd repot it into new, good soil and water thoroughly and put it in very bright sun eventually. I have jades outside in FULL SUN...and once they're used to it, they love that. If you do it too suddenly, though, it will burn the leaves.
Good luck!
Grace
