Here’s some information on your options for accessing your Office 365 hosted email account:
1. The Outlook Web App
You can access the Web App by logging in at the Office 365 portal: https://office.com
Log in using your email address and password, click Apps, then click the “Outlook” icon. This will be your web-based email application for your Office 365 email. For more information, please check out the following: https://support.office.com/en-us/article/mail-in-outlook-web-app-ed7b1cb9-ef40-4fbd-a302-278cc7f4dcf5
2. Outlook email application
If you have the Microsoft Outlook software installed on your computer then you can also configure that software to send/receive messages for your Office 365 email account. Please see the following link for information on how to configure the Outlook software for your Office 365 email: https://docs.microsoft.com/en-us/office365/admin/setup/setup?view=o365-worldwide&tabs=BusPremium#3-set-up-outlook-for-email
3. Office 365 for iOS and Android
You can also access your Office 365 email account on your mobile devices using Outlook or iOS and Android. For more information, please see the following:
https://products.office.com/en-us/outlook-mobile-for-android-and-ios