Once you are logged into your Digitalme.Credly account visit "account settings" on the left hand side.
Click the pencil icon next to the email section and enter your email below. Then click the "Save Changes" button below.
Once you’ve verified the email address you will be taken back to your profile.
Visit "account settings" again and you should see your old and new email address under the "email" section.
Click the "edit email" option again and select the new email as the primary email and click "save primary".
Your new email address is now the primary option and you can remove your old email address from you account by clicking "remove".