help with postback pixel on maxbounty/cpvlab

so im on mb and im trying to figure out how to set up the postback pixel and I plan on tracking with cpvlab. I dont know if what im doing is correct because this is my first campaign and i want to set everything up correctly. I dont care so much about it being a profitable campaign as much as I do setting it up.

Issue
this is how mb expains to set up the postback url but my affiliate link is in this format:
http://www.mb01 .com/lnk.asp?o=xxxx&c=xxxxx&a=xxxxxx&l=xxxx/?s2=xxxxx

how do I get it to where it looks like what mb is exemplifying. And if someone can answer how I would then tie that in with cpvlab that would be so very much appreciated, but my main issue is the postback pixel at the moment.

Code Snippet Value Returned in Callback
#S1# The value that was in the s1 on the click that generated the lead.
#S2# The value that was in the s2 on the click that generated the lead.
#OFFID# The ID of the campaign for which a lead was generated.
#IP# The IP address from where the lead was generated.
#RATE# The rate that was paid for the lead.


Examples
HTML Callback:
<img src="http://www.mysite.com/callme.asp?s1=#S1#&ipaddress=#IP#" width=1 height=1 border=0>
<img src="http://www.extratracking.com/gotlead.php?campaign=#OFFID#" width=1 height=1 border=0>
<script language="javascript" src="http://www.moretracking.com/extratrack.asp"></script>

URL Callback:
http://www.mysite.com/postback.php?memberid=#S1#