Here's how to add or edit the playlist image:

1. While looking at the playlist, click the 'i' button in the header.

2. From here, click on the Playlist Image to open the image uploader.

3. Click the upload image icon and select an image from your computer or drag & drop an image from your computer into the modal. You can also select your account's Default image if you'd like by clicking on it.

4. Once the image uploads, you can use the cropping tool to capture the portion of the image you wish to use. Once you’re done cropping, click the Done button.

Note: You can set a default image for all playlists in your account settings. To learn more, click here.