Hi,
Open your config.xml and search for ListenPort="7001"
and then replace the port number whatever you want. I think you have to make changes
at two places and then you can change SSL ListenPort but this is not required.
But before making changes to config.xml you must take the backup of config.xml, 'coz this file is very dangerous(if any wrong thing happens in config.xml you cant restart your server, in that case you can restore your original config.xml from backup).
Regards
Rashid