Problem to logon to the server EP

Hi

I have installed netweaver04s Ep .Installation was successful.But Iam unable to logon to the Ep. I have taken By default port no. for Ep is 50000 but our Http port is 80 .So how can i change this port to 50000 0r 80 .So that j2ee engine can listen.

could any body help me.

with regards,

eswar.