What you will do in order to track clicks is add the ";click=" and ${CLICK_URL} into the redirect string as below.
[timestamp] is exchanged for ${CACHEBUSTER}.
<script language="javascript" src="http://track.adform.net/adfscript/?bn=43547;click=${CLICK_URL}"></script>
<noscript>
<a href="${CLICK_URL}http://track.adform.net/c/?bn=43547;c=0" target="_blank">
<img src="http://track.adform.net/adfserve/?bn=43547;srctype=4;ord=${CACHEBUSTER}" border="0" width="468" height="60" alt="">
</a>
</noscript>
Note: this describes the usage of external non Adform related systems and please check respective documentation for most up to date information.