Could not see the related menu to E-newsletter after installed and activated the plugin

MlleSoleil
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Just Getting Started

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Hello,

I installed and activated the E-newsletter plugin for WP Multisite, I do not see any related menu to this plugin in order to create a newsletter. Moreover, when navigating to my subdomain site, I got the following error: Notice: A session had already been started - ignoring session_start() in /usr/share/wordpress3/installeddirectory/wp-content/plugins/e-newsletter/e-newsletter.php on line 1481

It would also be very helpful if more information on configuration and how to create a newsletter could be provided.

Thank you,
Sawitri