[Plugin: User Access Manager – NextGEN Gallery Extension] Adding Login Form

Hi, Please kindly help how to add login form for those who do not have the rights. I added “[Login Form] into the Album or Gallery content field, but the login form cannot be triggered. Kindly advise on how to trigger the login form. Thanks a lot!

http://wordpress.org/extend/plugins/user-access-manager-nextgen-gallery-extension/