RE: The Bot Libre Open Bot Directory and External Bot API

It would most likely be easiest to create a new bot on Bot Libre and import your AIML file that you used on Pandorabots.

You can also link to the bot on Pandorabots directly, either by creating a bot link, or a "proxy" bot.
For the link, if your bot uses the old Pandorabot's API, it is fairly straight forward.
If your bot uses the new Pandorabot's API, the new API is most complicated, so you would need a "proxy" bot and need to make Http calls to their web API using XML or JSON.