Invisalign patient: am I suppose to "bite down "on bite ramps?

.I am in my refinement stage . I was given 5 more sets to wear which include bite ramps behind my upper four front teeth. They are comfortable but was curious if I am suppose to be biting down on them? ,Right now they act as a stopper so I am not clenching my teeth. Do I use pressure or just ignore that they are there?