I solved this in a bit different way. Changed three things: 1) Add a custom page with your terms of use. 2) Admin -> Users -> Custom message in registry form - here add registration info and link to the terms 3) <your language folder>/qa-lang-users.php/register_button = "I accept the terms, register me"
answer from: http://www.question2answer.org/qa/11941/insert-agreement-to-site-terms-of-use
answer can be found here:
http://www.question2answer.org/qa/11941/insert-agreement-to-site-terms-of-use
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