Weebly requires the Starter plan at a minimum to remove Weebly branding and create an individual footer.
To embed code, you’ll need to drag and drop the Embed Code function Embed Code to the area of the page where the code is needed – one at the top after the <body> tag and one in the footer before the closing </div> tag. Below is the button you should be looking for.
Click the area to set custom HTML, choose Edit, and then paste code within. Do this in both areas.