Selecting "Settings" from the main navigation along the top menu will let you get to your user and blog settings.

The "User" setting enable you to set your own banner and profile picture, as well as other key information like email address, bio, and password:

The "General" settings enable you to set a description of your blog, it's title, as well as logo and cover.

Additionally, this is where you can select which theme you'd like to use - more on that soon.