Hello. My name is***** to JustAnswer. I'm reviewing your question now, and will post back with your reply momentarily.
Can you confirm your other wifi in the house is working (to your phone, tv, computer etc)
If they are, what is the make/model of your kindle?
If you know how to go to your settings and network, drop the network/forget. restart your kindle
and go to your settings and reconnect to your network with password.
If you need help in this, just send your make/model and i will send you steps.
Please rate the 5 stars at the top of the page to close out this question as it is the only way i amcredited for the work done with clients. Or, reply to continue if further troubleshooting is necessary.~Franklin