Setup login doesn't work

Initial set up does not allow me to log in to my existing account. There are several bugs on your form validation. When I type my email address, validation continues to ask for a valid email. If I go through to "can't log in" and then return to log in then sometimes email is accepted but then I encounter the same problem on entering password. I tried instead to set up an new account, this works but when connecting to my github account, I log in but then go back to the screen for connecting my accounts and it doesn't allow me to go to the next step.