Please note before updating your email address that you cannot use the same email address on more than one account. Please make certain the email address you update to is not already associated with a Splice account.
To update the email on your Splice account, first be sure you're logged into the Splice website.
Then navigate to the Account section of your Profile settings, which can be found here: https://splice.com/profile/settings
Once you've entered your desired email address, select the blue Update button to save the changes.