You can find other Hill profiles on WikiTree by using the quick finder tool bar at the top of most WikiTree pages (ie not G2G pages). If you go to your profile page you will see the the quick finder is already autofilled with the Hill surname - just click the little magnifying glass icon next to that. When the next page loads it will show you all the Hill profiles on WikiTree, use control F and type "Pennsylvania" to find ones that are from that area. When you find profiles that you are interested in finding more info about, just send the profile manager a private message. Good luck and happy hunting!
Wendy is right though, your next step in your WikiTree journey is to decide if you'd like to upgrade to Family Member level, as Wendy said, it is completely free, and will allow you to communicate with cousins and others on WikiTree, and will also enable you to create profiles for your ancestors.
Hope to "see" you around!