Even with a disability, should I scold my child when they do something wrong?

Discipline is not "to punish" but "to teach good behavior." Dangerous things and hurting others need a consistent, brief "no," regardless of disability. But rather than getting emotionally angry, showing the reason and what to do instead concretely in a calm voice gets through better. The more time a child needs to understand, the more it matters to repeat the same response and same words each time. Not continuing to blame after scolding, and firmly recognizing them when they do well, is what grows desirable behavior.