You can add a favicon to your Jumplead landing pages from the 'Customisation' page in landing pages wizard.
The code that you add within the Customisation page is simply added to the <head> element of your landing page.
So it's simply a case of adding standard favicon include tag and saving your changes as you exit the set up wizard.
Here is an example that includes the Jumplead favicon:
<link rel="icon" href="https://jumplead.com/favicon.ico" type="image/x-icon">
You will need to update the href attribute to link to your own favicon.
Here we can see the favicon in place on our landing page:
If you are using our legacy landing page builder you can add your favicon code into the head tag of your landing page form the 'Head tag' section in the 'Advanced' section.