How do you use mud to texture a wall?

There are many ways on how you can texture the walls. Here's one of the ways. Its called The Knockdown Sheetrock Technique:

Required Tools and Materials:

Drywall texturing utility

Taping knife (10")

Mud panDrop cloth

A bucket of water

Paint roller pan

Sheetrock mud (5 gallons)

Instructions: Firstly, thin out the mud. Once the mud starts to thin, you can dip the drywall brush into it. Push this in the sheettrack and then take it off. Next, position the knife at 45 degree angle and then drag the knife so it levels the peaks. Remove the excess mud with the helps of a mud pan. This may take more time than the roller technique but it's easier to re-stomp provided you keep the mud damp.

Happy to help you.