On your LeoFinance Wallet you should have an option to download your Hive Keys. To post, vote and comment you only need your posting key but I recommend you using the Hive Keychain on PC browser (if you haven't already) or Hivesigner is another option to import your keys.

If you keep having problems I recommend you joining the LeoFinance Discord Server: https://discord.gg/E4jePHe.

Also, you can send me private message on Discord (eddiespino#1698), Telegram or Twitter, you can find me as @eddiespino. I will be happy to help.