Comment blocks are optional and can be added anywhere in the file. You can view the images by highlighting an Image block. You can view and edit the settings in any block by double clicking it. A new Image block is added just below the highlighted block. In Gifcon, remember when inserting a new Image block to also insert a Control block above it.
Most programs accept the standard image file formats.
Sometimes when you add a new image to the animation file, you may get a dialog regarding a color palette conflict. If you've been following these instructions, your desired global palette should be already in place and the file you are inserting should already have the same palette loaded. Often the reason for the conflict isn't that the colors are different between the global palette and the image you are inserting. In this case Gifcon will adjust the order of the colors without changing the colors themselves. There is rarely a need to edit anything here.