On HIVE, if you leak 1 key, in order to change it, you need to change all keys. There are 4 keys on HIVE.

Owner (can change all keys)
Active (can do transfers and other stuff)
Posting (can post and comment, simple stuff)
Memo (can encrypt/decrypt memo messages)

And then there is a master password, that you should never use, that derivates all the above keys (hence the reason for never using it).

If you go to https://peakd.com/@snownz008/permissions there is an option to change your password/keys (CHANGE PASSWORD tab). Make sure you save your new keys in a safe place again and then update all the apps you use, the new keys (if you use ecency for example, you will need to use the new posting keys generated). Same for any app you have previously entered any private key.

Private keys (the ones no one should know) start by "5"
Public keys (the ones EVERYONE knows, because they are used by the blockchain) start by "STM"

This is a heads up, for when you are about to use a string that starts by "5" to not include that in a broadcast that is going to be public (such as the transfer of HBD that you sent to yourself).

If you need more help, contact me on Discord. Any HIVE channel you are on, you can probably find me.