When editing a board you can search through the repository of open-licensed symbols provided by CoughDrop, or you can always use your own pictures as well. Pictures can easily be provided by URL, file upload, or webcam snapshot. You can also do minor edits to images, and specify licenses for your images so that others who copy and modify your board will be able to maintain proper attribution.
Snap a pic
Hit "Take Pic" when you have the picture you like.
Once you've taken the picture you can review it, specify a license, edit it, keep it as is or discard the new image. Hit "Use This" the complete the image update.
Entering a URL to an image
You can also specify images by URL rather than webcam. To do this just paste or type a URL in the search field and hit return. You should see a preview of the image appear for review.
Find the image file
Find the file you want and select it.
Fun side note: you can also upload images by dragging them from your device's file browser and dropping them on the button where you'd like them to appear. This will not work on some browsers.
Pick an optional license
Once you see the image preview you can specify a license, including author information if it's attributed to someone other than you.
Editing an image
You can also hit "Edit Image" and an image editor interface will appear. This lets you crop and zoom the image, as well as invert it or colorize it for consistency. Once you're done hit "Use This" or "Close" to finalize your changes.
Board review and save
After you close the button settings window the updated image should appear on the board. Make sure to hit "Save" when you're done to finalize your changes.