Hi @diggedag. You will need to make your banner image first, then upload it to a webserver so it can have a direct URL. Then you simply paste that in. So, for example, if you have a wordpress site (which you can get for free) you can simply upload to the media section. If you don't know how to do that, let me know and I will host it for you on my website (which is where my banner is pulled from). Hope that helps. Do check out @minnowmentor for free support for newbies and minnows, and also check out the #promo-steem posts, of which I'm part of the team. We are committed to helping new members and minnows get the support they deserve and to spread the wealth around Steemit.