The first thing to do is login to your 'back office'. This is where you control the content of your site. Just visit: http://www.yourdomain/login
The posts menu is pretty self explanatory. From the 'Post' navigation button you can control all the elements of your posts including creating new ones, looking at and or amending old ones, adding tags (to help people search your site) and list categories for types of news content. Click the image for more detail on how to create a post.
Media is your photo library, video bank, file storage depot. This is where you upload images to be used in posts and pages you create. As with all things about this system, it is self explanatory and simple to use.
Like the posts menu, the pages menu is also self explanatory. From here you can edit the content of existing pages or add new ones as you like. Click the image for more detail on how to create a post.