For forms: 
1. Navigate to Communities > Forms > (Single-Step Donation or Registration)
2. Hover over the name of the form and click Website Info
3. At the top of the page, there is a URL by Web Address. This is the URL for the Sphere form.

For FAF events: 
1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
2. Hover over the name of the thon and click Website Info
3. At the top of the page, there is a URL by Web Address.  This is the URL for the Sphere FAF event.