What you will do in order to track clicks is add the ;click= and %%C%%?_RM_REDIR_= into the redirect string as below.
[timestamp] is exchanged for %%REALRAND%%.

<script language="javascript" src="http://track.adform.net/adfscript/?bn=43547;click=%%C%%?_RM_REDIR_="></script>
<a href="%%C%%?_RM_REDIR_=http://track.adform.net/c/?bn=43547;c=0" target="_blank">
<img src="http://track.adform.net/adfserve/?bn=43547;srctype=4;ord=%%REALRAND%%" border="0" width="468" height="60" alt="">

Note: this describes the usage of external non Adform related systems and please check respective documentation for most up to date information.