Although, PHPLD offers nice option in its panel to make all submitted links nofollow but I have found that many template designers dont use proper PHPLD formatting technique due to which the nofollow doesnt actually work with many templates.

phpld-nofollow-links
The admin panel method is to change the following option in Admin Panel> System > Edit settings > Payment.

Therefore, I use a simple MySQL command to make all existing “free” links nofollow in phpld. This command does not affect the “featured links” which will remain “do-follow”.

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UPDATE PLD_LINK SET nofollow='1' where featured!='1';

This command has to be run in PhpMyAdmin or through a PHP file.