1) Go to https://portal.office.com/. Sign in with your Outlook account. 

2) Click on Mail. Outlook will open up. 

3) Click on "New". 

4) Click on "Add-Ins". 

5) Select Mosspaper's add-in. 

6) Click on "Get free account".

7) Fill out the fields for a new account. Click on sign up. 

To view your Mosspaper account, go to https://app.mosspaper.com/accounts/login/ and log into your account.