Yes! You are able to update your login email address and your password from within your account.
To update your (or any secondary user's) login email address:
1. Go to Account > Users & Permissions
2. Click on the email address that you want to edit
3. Replace the existing email address with the updated address
*Note that only users with permission to Edit in the Account area will have the ability to make these changes from within your account. Learn more about adding and managing users here.
You can learn how to reset your password here.