Please i need help on how to disable a button until a user click a check box

So the title of the post is regarding checkbox disabling. That's easy to do with JavaScript. here is an example..

<script>
function disableElement(){
  document.getElementById("#chkBox1").disabled=true;
}
</script>

Your description sounds like you want to enable a button when a checkbox is checked? There is another thread on this site that seems to be very similar to what you are asking:
http://www.daniweb.com/web-development/php/threads/116536/check-box-enable-button

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