You may remember from your initial Notable account set-up that you can only set your subdomain name once. But did you know that you can edit the company name that displays on your account? Just click on Account Options, then Edit to access the company name field.
You can also change your display name and avatar at any time. Just click on your name in the upper right corner of the screen to edit your profile info. Any updates you make to your display name and avatar will carry through to all your old posts, but please be patient: it can take up to a day before all the info is changed.