When building a new issue, scroll down to the section that says "Upload Comic Images."
You can click the "Upload Files" button and find the images using the file browser or drag and drop the image files that you want to upload from your computer's desktop or folder into the box with the dotted outline. Your image files will begin to upload at this time.
Once your files have been uploaded, thumbnails will appear on the page.
You can rearrange your images in the order that you like by clicking and dragging on the button with three lines on the left side of the thumbnails.
You can delete uploaded images individually by clicking the Trash Can icon on the right side of the thumbnail.
Be sure to click 'Save Changes' so you don't lose your progress!