Got to have the evaporation pad there through out the incubation. I just went back to the site and it is under the News column to far right and look for resource room II and click on that, another menu will come up and it is the third one down; (how to use ) Fitting evaporation pad. I don't think it would be wise to use the humidity pump without it. Try the site again and let me know. The video really help me. I couldn't figure it out either with their directions on paper.