How do I check my icloud mail if I don't have my iphone?

My phone was stolen i put it in lost mode and when i sign in to my icloud to loook at mail it ask for two step verification.

1. Open Mail and choose Mail > Preferences.
2. Click the Accounts tab.
3. Select your iCloud email account.
4. Click the Account Information tab.
5. Choose your iCloud email account from the Outgoing Mail Server (SMTP) menu.