You can access your profile by clicking on the Profile widget in the sidebar or clicking on your username next to the word "Howdy" in the header. This "Howdy" reference is a way of letting you know that you are logged in under your username. Some admin systems may have multiple users logged in at once so this is a useful tool for making sure you are logged in correctly.
The Profile screen looks like this:
In the Profile screen you can change your personal options, name and contact information.