Hello Jason,
Do you referring to mod_easysocial_dropdown_menu? If yes, can you download this attached file, put it in your site here: \modules\mod_easysocial_dropdown_menu\tmpl\default.php . Then, copy this:
COM_EASYSOCIAL_TOOLBAR_SIGN_IN="Sign In"
and put it in your language file. If you unable to do this, perhaps you can provide us with backend access and FTP access so that we can help you fix this.
Please be advise.
Thanks.