What did Mr. St JOhn inform Jane about?
Are you asking about St. John Rivers in Jane Eyre?
Check this site.
http://www.sparknotes.com/lit/janeeyre/
To find out what Mr. St. John informed Jane about, we would need to refer to the source material where this information is mentioned. If it is from a book, you can look for the specific chapter or section where the conversation between Mr. St. John and Jane occurs. Within that passage, you will likely find the details of what Mr. St. John informed Jane about.
If you are referring to a specific piece of literature, it would be helpful to provide more context or mention the author and title of the work. With this additional information, I can assist you in providing a more specific answer.