Jimmer,
Many of the plugins create new icons on the toolbar, and don't necessarily appear in the drop-down menus.
When a plugin is installed in the plugins folder, you must re-boot CB to cause it to recognize the new material.
So far as I know, the trial version does not restrict their use, but some plugins are only for certain release versions. 0.9.8 should be expected to work with most of them, but not all.
LLoyd