Lift the fixture up into the junction box and align it with the mounting screws. Safe the fixture by tightening the screws. If you need to do select a dimmer switch, It's also wise to recognize that CFL, incandescent, and LED lights will all respond in a different way — https://edgarnsuur.blogozz.com/33907828/how-smart-light-switches-can-save-you-time-stress-and-money