changing or adding water

[lil.guppy]

Ok I am about to set up my 46 and I want to know how do I add or change the water in a few weeks after evaporation or to clean it?
I have one of those hydrometer things....
Do I just mix the salt water and add it like I would a freshwater tank. Pour it into the tank slowly?

 

[TimSchmidt]

For evaporation do not use more saltwater. For evaporation use fresh water (preferably RO/DI). Water change can be as easy as pull out old saltwater and pour in new saltwater.

Just make sure the temperature and salinity is the same.