On the first page, give your server name and database name and press Connect. The web page shows you the list of cubes that exists on this database. Choose one and press View KPI.
On the second page, you will see your list of KPIs. Choose a dimension to drill down into and then choose your hierarchy, then click on a KPI name to drill down into your KPI.
The third page shows you the KPI that you have chosen for the hierarchy that you have selected. You can continue to drill down.