How do I add a new account to my Mail app on my Mac?

To add a new email account to the Mail app on your Mac, follow these steps:

1. Open the Mail app on your Mac.
2. From the 'Mail' menu, select 'Add Account...'
3. Select the type of account you want to add (e.g. iCloud, Google, Yahoo, Exchange, etc.).
4. Follow the prompts to enter your email address and password, and any other required information (such as server settings).
5. Click 'Sign In' to add the account to the Mail app.

Once you've added the account, you should see it listed in the Mail app sidebar. From there, you can manage your email, create folders, and customize your settings for the account.