Follow the details below to add an email signature to Outlook
Open a new email
Select Insert Tab
Select Signature from the drop down menu
Create New Signature
Select the insert image icon
Select Image from your computer and click insert
Now set the image as a link by selecting the image and clicking the link icon
Enter the URL you want to link to
Select OK > Choose which signature you want for the default and now every time you open a new email your default signature will be added. You can create multiple signature to use for various email types and insert them while creating a new email by selecting signatures again.