Blog posts will show up on the home page and on the Updates page. Most posts will be blocked by default so that only registered users can add comments, but posts that are for the general public, like this one, are open for all to read. To add an image to the header and to the homepage link use the Feature Image at the bottom of the column on the right. If you don’t add a feature image the post will have a gray background on the homepage, If you want to use an image from your computer you can upload one when you go to set a feature image.
You can set the category for a blog post on the right. The basic category is general and need not change, but it can be helpful to choose a category that fits the topic so visitors can find posts that relate to specific topics.