Once you have logged into your email account in OWA, perform the following to create your signature:

1. click the cog (icon that looks like a little gear) in the top right corner next to your name and click Options


2. on the left panel, click settings

3. create your signature in the box under email signature

4. once created, fill the checkbox under it for Automatically include my signature on messages I send 

5. click Save at the bottom of the page

6. Finished