Start with this post - -
https://www.mobileread.com/forums/sho...&postcount=192
Skip the original JB install, you did that -
Skip the update, your Kindle did that for you -
Skip the launcher install (unless you want it) -
Listen to the music -
Immediately after the music, there is a link to the Kindlet-Jailbreak - do that.
You can skip the rest of the page, the above should fix your problem.