Can you provide more details on this issue? What does happen when you want to log in? Do you have version 1.1.5 installed? Did version 1.1.4 work properly? And the last one question: do you use plugin which changes default login page name?
There was a bug in version 1.1.4 which caused problems with compatibility with plugins changing login page name but we’ve fixed that in version 1.1.5.
If you have access to FTP or SSH you can change the plugin folder’s name in order to disable the plugin. If you have access to the database you can find twofas_light_totp_status setting in the usermeta table and change it’s value from totp_enabled to totp_disabled. If you don’t have access to FTP and database you must contact your hosting provider to do it for you.