Touch the walls to make sure the texturing is completely dry. If the texturing is not dry, you should not paint the walls until it dries all the way.
Pour painting primer into a paint tray. Slide a looped roller onto a paint roller. Coat the roller with primer and paint the primer on the walls in a “W” motion. Do a light coat of primer on the walls and let it dry. The primer will look splotchy but it doesn’t have to be even because you are painting over it.
Pour latex paint into a paint tray. Slide a looped roller onto a paint roller. Roll the paint roller into the latex paint. Apply the paint to the walls. Roll the paint in a “W” pattern, the same way you rolled the primer onto the walls. Let the paint dry. Repeat as necessary.
Cut in around the edges of the walls with a paintbrush. Use the paintbrush to get into corners and along the edges of the walls.