1. Click on your name (seen at top-right navigation) from the dashboard and then click the "Profile" option.

2. Click on the Edit Section link besides Personal Information. 

In case you have an Org account with multiple teachers, you simply need to go to edit section and enter the email you wish to change.

Here is how the edit section would appear:

For Individual teacher, edit section appears as follows:

3. Click on the Change email address link option on next page. Remember you can change only your verified email address. If the email address is unverified you can’t change it.

4. Write your new email address and click on the Save & Send Confirmation email button.

5. Verify your new email address using the link received in your updated email inbox.