@Crystal-Faith0 Talk to your property insurance company about the validity of waivers and if they have an approved form that you could use. Airbnb does not support posting and signing waivers, so you will have to write in your description that waivers will be provided via email and must be signed prior to guest arrival.
I use SignNow to send rental agreements and other documents to guests. I believe that Adobe Acrobat also has signature capability.