Use Signature from Directory
Go to InsideState Directory and search your name.
Click your name.
There is a button "Copy to Clipboard" under Signature.
Always use this for your signature.

Instructions for Outlook Web App (OWA)
Log into outlook.sdstate.edu with your SDState email and password
Click the Settings button in the top right

Select 'Account'

Select 'Signatures'

Click '+ Add signature'

Name your signature, paste your signature from InsideState into the box, and select 'Set default for new messages' and select 'Set default for replies and forwards'

Save