If you already have the link to your signature card from the Helpdesk then follow these instructions below.
Open the link sent to you with your new signature in Google Chrome
Click anywhere on the page, then click Ctrl + A to select all. Then, hit Ctrl + C to to Copy
In Outlook 2013/16, click New E-mail. Click the Signatures Icon, then Signatures again
Select New, and give your signature a name.
In the Edit Signature box, Hit Control-V to paste.
Select the new signature you just created for New Messages and Replies (if you want to).
Then, click OK and you should be set up and ready to go.