how to add a family member
How do I have someone on a different level (higher) sign up on the same computer?
Where it says your name at the top of the page there's a drop down menu of Your Profile, Settings, Keyboard Shortcuts, and Logout. When you wrest the computer away from your brother, you go to his name, and select Logout. Then you log in as yourself. Similarly, when he steals the computer back, he clicks your name and selects Logout, and then logs in as himself.
To start with, however, have him log you out and then click Sign Up, just like you did when you started. Just make sure you remember your password before you let him sign you out!
More than one person can sign up if there's more than one e-mail address. What do you mean by signing up on a higher level-- do you mean your family member knows some Spanish already?
I think it only shows the from how long ago the original post was made. I don't think it changes when someone makes a comment.
If you want to skip the beginning skills, you can "Test Out" on them, too. It makes sure that you know the material required to proceed before unlocking the newer skills for you to either "Test Out" again or complete.