How you use a ChatGPT Plugin depends on the plugin you install. Generally ChatGPT plugins usage is like regular ChatGPT. You ask your question and ChatGPT provides an answer. The accuracy of the answer depends on the quality of the prompt and on the quality of the ChatGPT Plugin. You can ask ChatGPT for instructions on how to use the new plugin by providing the name. ChatGPT will display the name of plugin if it used a plugin to provide the answer.