You can squish the scales to destroy and remove them by running pinched fingers along the branch, you can prune off the infested areas and dispose of them in the garbage, you can try spraying the infested areas with a high pressure water spray to dislodge the scales (scale insects only move around after they hatch out of the egg), you can use an insecticidal soap on the scales (this will kill them, but the covering will remain on the plant even after the insect underneath has died, so you will need to physically remove the coverings).