Your collection's cover image is what will show in search, on your profile page and if you share it on social media. To change it:
- Open up your collection by clicking on it (all of your collections can be seen on the homepage).
- Click the green 'Edit Collection' button in the top-right.
- Click 'Add a Cover Image' or 'Edit Cover Image' if it already has one.
- Click 'Upload an Image' to choose from your device, or 'Choose an Image' to choose from Unsplash, a free image library.
On the right you can also choose to show the 'Full' cover image, 'Half' or none. This only affects what shows when inside your collection.
See this video for more: