If your dreadlocks are brand new, you don't need to do much with them for the first week. If they were waxed properly, you may just need to deal with an itchy scalp. To do this, spray the scalp with a cooling spray. After a week, start shampooing your dreadlocks regularly. Be sure to dry them thoroughly after each washing.
Tighten your dreadlocks using a method called palm rolling. Take a dreadlock between your palms, and roll it as if you're making a snake out of dough. This tightens up the knots. The result is better-looking, tighter dreadlocks.
Since hair never stops growing, your roots grow out without being in dreadlocks. To tighten your roots, grab them between fingers and rub them clockwise. This should knot them up and make them tighter.
When it comes to waxing your dreadlocks, a little goes a long way. Rub a little wax on each of your dreadlocks to speed up the dreading process and to make sure the dreadlocks stay free of lumps and bends.