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To get started, go back to the Softaculous Wordpress screen, and scroll down a little to hit the "pencil icon" for your newly imported WordPress install:
On the edit screen for your Wordpress install, all you need to do is click the checkboxes next to what you want to auto-update in order to have Softaculous automatically check for and install updates to your WordPress core, plugins, and themes:
Once you've saved your settings, that's all there is to it! You're all set.
Good luck and have fun!