You can change the primary email address associated with your account on your account settings page.
Add the new email address at the top of the page and click "Add Email."
A verification email will be sent to the new email address you have added. The new email address will not be associated with your account until you verify the email address.
To verify the email address you have added, log into the email account you've just added and open the AngelList email. Click the "Verify Email" button.
Your new email address will now appear as a "secondary" email address associated with your account.
You can change this to your primary email address by clicking the "Set as Primary" button. You will be prompted to confirm your password to finalize this change.
Once you do so, the new email address will be the primary address. You can then delete the old email address by clicking the trash icon beside the old address.