Visit your account preferences to update your personal info.
You can manage your profile information, like your name, avatar, and other personal preferences by clicking the organization icon in the top left and selecting "Account Preferences" from the dropdown menu. Here, you can click the “Edit” link next to each field and update how your name appears, your avatar, password, time zone - even your preferred Emoji style. Once you’ve edited the info in each field, click “Save Changes” to make it so.
You can also add a job title to your profile on the People & Teams page. Just click the organization icon in the top left and select "People & Teams." Then click your avatar to open your user pane. Once open, type your job title into the "Add job title" field and click anywhere outside the field to save.