Are you using Steam? If you are it is all automagic, if not
1) Download Warband 1.168 and reinstall it. That will make sure you are playing the correct version of the game
2) Did you get VC 2.023? If not you need to redownload the DLC and install it
(two different downloads, you need both)
After that is done if you still can't play you will need to provide more details. "It doesnt show up" doesn't tell the devs much. How about you post some screenshots if you are unsure how to explain it?
( you cant post links, so just replace dots "." with spaces " " like this www dropbox com mylink)
Native support: if you can't play native you need to visit the Warband tech forum ->
https://forums.taleworlds.com/index.php/board,164.0.html
DLC support: support forum for VC is here ->
https://forums.taleworlds.com/index.php/board,376.0.html
Remember to include the usual rgl_log.txt, rgl_config.txt, etc on your report