If you go to "my account" down in the page you should see your hubs and should be as easy as clicking "Edit" in front of them. If you don't have a Hub yet, you should log in to your account and look at the top-right of the page next to your account name and you shall see a "start a new hub", click on that. Then follow instructions, title, etc. After that you select the layout and click edit in each box (text, picture,etc), after editing click save and it will appear on your hub. After you finish editing and saving scroll up and click publish.