I can not login to WP dashboard because of underinstruction

Hello, i need your help
my website is http://www.thaifluent.com
I just installed UnderConstruction plugin
then i logged out from WP dashboard and tried to login again but it shown the page was underconstruction even i tried to go to http://www.thaifluent.com/wp-admin or http://www.thaifluent.com/login it still shows that my web is underconstruction

Could you please help me how to get back to WP login again?