Adding an HTML signtature to Outlook

Good morning,

I am trying to update my HTML signature in Outlook. The HTML signature is perfect and I am happy with it, so it is just the matter of changing the signature in Outlook that I am battling with.

I have gone to Create a New Message, then selected Signatures and am at the stage where I create a New Signature. I have created a new signature name, and in the text box I have pasted the HTML code (I opened the HTML code on my browser and copied that and pasted it into the text box) but the code does not display the signature, but displays as the HTML code start with https://......

I do not know how to get it from the HTML format to the 'signature'

If you could please assist.

Regards

Tarryn