BI Portal URL ???

hello experts..

i understand that when a BI system is installed there is a BI Portal installed as well. i.e you get a link (URL) to access the BI Portal and this comes by default when a BI server is installed. in my company we dont really use that but i am curious to know how to access that link as it seems to exist and is lost somewhere in the server...can someone walk me through a solution for this. ???