Classic Version of Outlook instructions are below.
To show the 'From' Button in Outlook, open a new email and go to the Options tab and click the From button
This will then display the From button in all new emails.
Click the From button and the select Other Email address
In the window that appears type the new email address in the text field, click OK and then that new email address should show up in your options when you click From in the future.
-----------------------------------------------------------------------------------------------------------------------------------------------------------
If you are using the new version of Outlook, do the following...
Create a new email message by pressing the new email button.
On the right-hand side, the message needs to be opened into a new window. Click the pop out to new window button.
Then, once the window has popped out, click options, and tick the from field.
