When you come to the website URL field, type in your domain name and then click 'Verify Website.' On the next page, click the link that says 'Verify with a meta tag.' This will generate a verification code. Copy the code and then, in a separate window, log in to your SpaceCraft tool. Click into your Settings, and right there, under your Site title, Google verification code, and Bing verification code, is a field for your Pinterest verification code! Paste it in and click Publish. Now, head back over to Pinterest and click the link that says 'Click here to complete the process.'
Now that you're verified, a little green check mark will appear next to your name, letting your Pinterest followers know you're legit. In addition, you can now access Pinterest Analytics which will allow you to see which of your pins people are engaging with the most and a whole bunch of other stats. Check out the video below for a walkthrough of how it works.