Use the “About This Member” section to tell your personal story. If you're hosting, what's special about your accommodations? Do you live atop a hill? Right off the trail? Near a bike shop? Are you an excellent chef, might you order pizza, or should guests bring their own food? If you're touring, where did you start and where are you going? Do you have a blog? Any dietary restrictions? Information like this can help prospective hosts or guests decide if you would be a good fit or not.
For most people a profile picture is very important. It does not have to be a picture of you, but can be a picture of your house, town, or bike.
Fill in the explicit questions as well as you can and as completely as you are comfortable with. You do not have to disclose your street address or phone numbers, but if you are hosting, the map should indicate where guests would stay within a reasonable distance.