User manual

3.2.2. Set up other mail and calendar accounts
In addition to the apps that come with your phone, if you want to use other mail
and calendar apps, add the accounts to your phone to let the apps associated
with those accounts sync with your phone.
Set up an account. Go to [Settings] > [Accounts and Sync], then click [Add
Account].
Repeat the steps for as many accounts as you like.