STEP 1: Click on the first + icon at the top right part of the page
STEP 2: Choose an upload method/source
Allowed file formats are: JPG, PNG and GIF.
STEP 3: Upload the file
STEP 4: Describe & Categorize
Create a new board if you want to group the images (i. e.: Of the same model)
STEP 5: Link your source
If you are not the creator, link the source so the authors get credit for their creations
STEP 6: Confirm
Be sure to see the confirmation page to be sure that your pin was successfully created. Click on "Add Another Pin" if you want to repeat the process.
STEP 6: See This Pin or Share
Share the pin on social networks. Be sure that the content is allowed on each specific social network. Twitter and Reddit allows explicit adult images and porn. That's not the case for Facebook and Google+ that only allow "sexy" images but nothing explicit.