Go to the postbit template (in the admin cp) and and use the following code to display the level of the person:
PHP Code:
Level: $level<br>
I tested it on my boards and it worked so let me know if you have any questions or problems. As I said before, I am still kind of new at this stuff too. BTW, You can change the actual wording of the level display in postbit, just use $level wherever you want to insert that person's level.