Step 1: Upload a photo
(It also greets you by saying "Hi, Guest! Welcome to Picnik!" And underneath that, it says "Picnik gets even better if you register for free." To create an account, click "register for free".)
Step 2: After uploading, start editing!
The second picture included in this step is of me choosing to crop my picture.
Step 3: More fun editing
(For the effects that say "Premium" on the side, those are only if you choose to pay for an premium membership when you create an account.)
Click any of the tabs next to "Effects", such as Stickers or Text.
(With my picture, I chose to do CinemaScope in "Effects" and a heart sticker in "Stickers".)
Step 4: Save and Share
Step 5: The end.