room extension tutorial

hi guys

i am developing room extension like

http://help.sap.com/saphelp_nw2004s/helpdata/en/42/c30767feef1d74e10000000a1553f6/content.htm describes,

but I have a problem with point 2.Configure the Extension, where can I configure this extenstion?In portal,when yes, which sub menu?

It would be greatly appreciated if somebody gives me any hint

b.r.

Liying