log in issue

I just added a Social Sharing Plug in and now as I try to log on, I get a series of error messages;
// add_action(‘wp_head’, ‘social_sharing_css’); //add_filter(‘the_content’, ‘social_sharing’); //add_filter(‘plugin_action_links’, ‘social_sharing_settinglink’, 10, 2); //add_action(‘admin_menu’, ‘social_sharing_addmenu’);
Warning: Cannot modify header information – headers already sent by (output started at /home/content/34/8451134/html/wp-content/plugins/social-sharing-wp/social-sharing.php:175) in /home/content/34/8451134/html/wp-login.php on line 353.

I can log on but cannot get to my Dashboard or anywhere for that matter.

Thanks in advance for any help with this.