You can add custom code on your Landing page by using the “Code Mode” block located in the page builder.
Code Mode is an option available in the Email and Page edit form. It will allow you to create/insert/edit your content in HTML code. It’s helpful for situations where you don’t want to use a Adaptix theme and you want to use an HTML theme copied from a 3rd party theme builder or if you enjoy editing HTML code so much.
Drag and drop the “Code Mode” block to your page template and type in the code under the “Customize Slot” tab.