You should simply be able to follow our guide on how to install WordPress on an addon domain.
Basically you just want to select your addon domain from the Choose Domain drop-down, in the Softaculous installer and that's it. It will handle creating the new MySQL database for you and setting everything up.
You can have multiple WordPress installs on each domain, you would just install them to separate sub-directories off your domains. You don't need any further WordPress accounts, you just would want to run through the Softaculous WordPress installer each time you're setting up a new instance of WordPress.
Please let us know if you had any further questions.
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