Enter Schedule C in the Find window on the right, hit enter, then the Jump To. When you come to the summary, edit the business showing and walk back through the entries until you're asked about actively participating to change your answer.
I have to tell you, though, this will not change whether you pay SE tax or not. If you have more than $400 in income over and above any expenses you claim, you will still pay SE tax. Active participation determines whether losses are deductible or not against other income. Is this something you do regularly to earn more income? Did you make over $400?