Customizing letterhead including graphics in 6.0

Using Notes 6.0 having problems to create customized letterhead to include graphics. New graphics were copied and can be seen in Image resources but will not be displayed in Tools/preference/letterhead. What is the exact procedure in 6.0?

Subject: same as in R5

http://www-1.ibm.com/support/docview.wss?uid=swg21094814