Other questions about Newsletter Editor

Why does the system show an error message when attempting to save in the editor? What do inner padding and outer margin mean, in the newsletter editor? Can I copy complete content elements from a word file into my newsletter? Is it possible to integrate your ‘own fonts’ by means of a web font? Is it possible to set up ‘Repeat’ properties for the background image? In both the x- and y axis? How can I undo a change I made in the editor? Is the unsubscribe link automatically added to my newsletter or do I need to insert it myself? Is it also possible to include small videos in your newsletter? How can I align a text element or image in the editor vertically (top, middle, bottom), or horizontally (left-align, centred, right-align, block)? The newsletter looks different when sent as a test email to how it looks in the editor or preview (format, spacing, font size or colour are different). Why might this be? Is it possible to build a button into the newsletter for entering calendar appointments? Is there a function for making text elements and images into links? Is it possible to write text directly onto an image that was uploaded to the newsletter? How do I use the preheader? What is a preheader? How can I add my legal notice to my newsletter? How do I set an anchor? Is it possible to integrate a ‘Like’ button for Facebook into my newsletter?