Based on what you've got here, it looks like there's some important aspect of authenticating the plugin that's missing. It is likely that during the installation of the plugin it asked for either an Access Token or a Username and Password that were not provided. You shoul dbe able to correct this by going directly to your wordpress admin page at http://www.yourwebsite.com/wp-admin/ . Once you are in the admin page, you should be able to update the configuration for the plugin, or even disable/uninstall it.
If you continue to run into any issues, please let us know!
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