You can go to MarketKing -> Registration -> Registration Fields -> Add New and create a field with the following configuration:

You will then see this required checkbox:

You can set the link by replacing '#' with your URL inside the <a href> tag.
You can go to MarketKing -> Registration -> Registration Fields -> Add New and create a field with the following configuration:

You will then see this required checkbox:

You can set the link by replacing '#' with your URL inside the <a href> tag.
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