You can change the email address associated with your account at any time from the "Account preferences" page. Here's a step-by-step breakdown:
Step 1: Open your dashboard and click the menu icon in the upper-right corner (either the two horizontal lines or the circle with your initial).
Step 2: Click on "Account preferences."
Step 3: Click "Edit email."
Step 4: Enter the password to your Onerep account and the email address you want to switch to.
Step 5: Open an email from Onerep and click the "Confirm email" button.
You're all done! Your email address will be updated right away.