> The forum is:
> <http://www.trademe.co.nz/Community/MessageBoard/Defa>
> ult.aspx
> 
> But I just wish to download three of the available
> topics:
> 
> Computing, General & Opinion

Don't start there, start at the three topics:
<http://www.trademe.co.nz/Community/MessageBoard/Threads.aspx?topic=3>
<http://www.trademe.co.nz/Community/MessageBoard/Threads.aspx?topic=5>
<http://www.trademe.co.nz/Community/MessageBoard/Threads.aspx?topic=7>