You first need to log in or create a user account by clicking "Register" at the top of the site. Once you've logged in or activated your account you may follow any one of these steps.
From the Home page:
Visit the "Tool Kit - Non-Profit" section located at the lower right portion of the page and click the "List Your Organization" button.
From the Clubs & Non-Profits page:
Hover over the "Community Life" tab, located in the top nav bar, and click on "Clubs & Non-Profits." You will be taken to the town's list of Clubs and Non-Profits. Click the link titled "Add Your Organization" located at the top of the list in the blue banner.
From your profile:
Click on "My Profile" which is located beside the "Log Out" button in the top right portion of the site. Select the "Organizations" tab and click on "Add Your Organization".
Be sure to fill in the required fields that are marked with an asterisk (*) before saving your group. If the post goes through successfully, you'll be automatically directed to the published page.