Hi Mill
When you set up the patch for the first time it should detect those settings for you on default ports, however it doesnt always.
For a 56k connection I would do the following. Allow the installation to continue but during the Test for TCP connection just tell it you wish to configure it manually.
When its all installed, go to your WinMX Settings and choose 'Incoming TCP Connection' .. there you will see two options. Tick the First one 'Listen On Port 6699 for TCP connection.
Then look at 'IN/OUT UDP Connections'.. there set this to Send and Reveive on port 6257.
Now restart your WinMX as a Secondary connection.
You should be able to connect like this fine, uploads and downloads should work fine also..