You can link multiple accounts by using the following steps for each Google account:
1. Log out of your Google account and out of Remember The Milk
2. Open the Remember The Milk login page
3. Click the "Sign in with your Google account" link
4. Enter your Google account credentials
5. Enter your Remember The Milk account credentials
You can use the same Remember The Milk account each time in step #5.
Going forward, all the accounts will be linked and if you're logged in to any of those Google accounts, you'll be logged in to Remember The Milk automatically.
Hope this helps!
Posted 3 years ago