Step 1.
Go to Outlook.
Open the Outlook app on your phone.

Step 2.
If you have Outlook open.
Press the three horizontal lines in the top left.
A menu will open.

Step 3.
Click on the gear wheel at the bottom left.
The settings menu then opens.

Step 4.
In the settings menu, press Signature.

Step 5.
When you're done, hit the checkmark to save.