Check below link for details.
http://www-01.ibm.com/support/docview.wss?uid=swg21983556
By using above mentioned steps your final url will look like
http://servername:9300/bi/v1/disp?b_action=cognosViewer&run.outputFormat=HTML&run.prompt=true&ui.object=storeID (%22insert_StoreID_here%22)&ui.action=run&cv.header=false&cv.toolbar=false
9300[servername/ibmcognos/cgi-bin/cognosisapi.dll?b_action=cognosViewer&run.outputFormat=HTML&run.prompt=true&ui.object=storeID(%22insert_StoreID_here%22)&ui.action=run&cv.header=false&cv.toolbar=false