How can I add color to chalk paint?

Yes

You can add Rit dye. Or you can buy smaller sample size jars of chalk paint in whatever color you are trying to achieve and try that. I am thinking you want to add color to white chalk paint.

Yes I would also add color from other smaller pots of paint to tint your current color.

How to use white wax on wood furniture

How can I use white wax on wood furniture to change look.