Summary:
Unfortunately, iCloud.com does not support HTML email signatures. Please only use this guide if you’re planning to add a text-based email signature.
Step 1:
Once you are ready to set up your email signature, log in to your iCloud.com account and open Mail.
Step 2:
Click the Settings (cog-like) icon and select Preferences.
Step 3:
Click on the Composing tab.
Step 4:
Select “Add a signature” and then type your signature text in the field provided, such as Name, Address, Phone Number or anything you want to be displayed in your email signature.
Step 5:
Click the Done button. You have now installed your iCloud email signature and you can start composing emails.
To disable the email signature function in iCloud, simply unselect “Add a Signature” from the Composing tab and click Done.