Of course! You can easily edit your website at any time even after you hit Publish.
Simply click Site actions -> Edit Site
Once your website is published and live, log in to the Website Builder, make the edits you wish to make and click Republish in the top right corner.
For further information or to speak with one of our Support Agents, simply click on the link here and submit your message via the green Help button on the bottom right-hand corner.