Profile settings allows you to access and change general information about your profile such as Name, Email and Password. But perhaps more interestingly, you can set certain defaults that can make your work flow faster.
Going to Profile settings
In the top right corner, hover your mouse over your profile picture and select "Profile".
Setting Profile Defaults
In the profile settings you can change the default keywords page and "Compare to" parameter.
Perhaps you'd rather compare to last week? Or maybe you always access to keywords list first when going into your domain. This can be changed here.
Changing Profile information
You can also change user information here.