Which section do i insert rank math breadcrumb code using wpcode?

Hi, may i know where do i insert the following code using your plugin?

<?php if (function_exists('rank_math_the_breadcrumbs')) rank_math_the_breadcrumbs(); ?>

I was told (by rankmath support) that “To show the Rank Math breadcrumbs via PHP, you will need to add it to the single.php or header.php file of your active theme.”

I tried to add it in Header in the “Global Header & Footer” section, but i received error “special characters must be escaped : [<] and [>]”

or should i add it into code snippet, for example php snippet?

Thanks

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