Membership Admin menu not showing after install

Hi all,

I just installed the Wordpress Membership plugin and the admin menu is not showing. I'm using the latest version of WP on a single install. I uploaded the membership-1.0.5.zip file to the plugins folder, extracted it and it's showing in the plugins list. However, after activating the plugin, no Membership admin menu is added to the left. Nothing changes at all so I'm not sure what's going on.

I've successfully added some other plugins and they're showing and working fine so I'm not sure what the issue is with this one. I'm sure I'm missing something simple but I have no idea what it could be. Any help would be appreciated.

Thanks!