"Adding a chart" means giving permission to publish your completed chart in the OvuFriend Chart Gallery (every time you finish your cycle the system will ask you to add your cycle do the Chart Gallery). Your chart will be completely anonymous (it will not contain any information about you, no user name, etc.) and it will not contain any of your personal notes. Posting a chart takes a few seconds. When you click the button "Yes, I want to share my chart" the system will ask you to check the boxes which refer to your cycle.
For every chart you share, you will earn points toward free Premium membership. (How can I get the OvuFriend Premium membership free of charge?) Sharing your chart helps other women trying to conceive. They can browse it, analyze it, and compare it with their own cycles.