First, click "Create A New Offer" and select Pinterest Pin to Win.
You'll be taken to the Edit section to choose the general settings of your Pin to Win promotion. Set up your title, instructions, start and end dates, entry restrictions and if you will award bonus entries for referrals.
You can further customize your promotion by clicking Customize. On this page, you can build the look and feel of your promotion. You can select Elements in the left navigation to add any images and content. Also, you can click any element on the page like the entry form to manage that element and change its options. This is how you will add form fields to your form and update any content. You can also select Styles to change any of the font, images or colors of the promotion.
On the Entry page in the Customize section, select the Pinterest Gallery element to add or edit pins.
If you want to host the offer on Facebook, you'll need to click Facebook Page Tab, where you'll choose your tab name and install the tab.
Your Pin to Win promotion is ready to go! You can take your promotion out of admin-only mode in the "Edit" tab and start collecting votes. You do have additional options you can play with under the Language, Sharing, and Customize tabs, but this is enough to get you started. Happy pinning!