View http://www.mantisforge.org/dev/manual/en/administration_guide/c1562.html

"Just enter your username and password and hit the login button. There is also a Save Login checkbox to have the package remember that you are logged in between browser sessions. You will have to have cookies enabled to login.If the account doesn't exist, the account is disabled, or the password is incorrect then you will remain at the login page. An error message will be displayed.The administrator may allow users to sign up for their own accounts. If so, a link to Signup for your own account will be available.The administrator may also have annonymous login allowed. Annonymous users will be logged in under a common account.You will be allowed to select a project to work in after logging in. You can make a project your default selection from the Select Project screen or from your Account Options.SignupHere you can signup for a new account. You must supply a valid email address and select a unique username. Your randomly generated password will be emailed to your email account. If Mantis is setup so that the email password is not to be emailed, newly generated accounts will have an empty password."

With Paragraph breaks, is should render:
"Just enter your username and password and hit the login button. There is also a Save Login checkbox to have the package remember that you are logged in between browser sessions. You will have to have cookies enabled to login.

If the account doesn't exist, the account is disabled, or the password is incorrect then you will remain at the login page. An error message will be displayed.

The administrator may allow users to sign up for their own accounts. If so, a link to Signup for your own account will be available.

The administrator may also have annonymous login allowed. Annonymous users will be logged in under a common account.

You will be allowed to select a project to work in after logging in. You can make a project your default selection from the Select Project screen or from your Account Options.

Signup
Here you can signup for a new account. You must supply a valid email address and select a unique username. Your randomly generated password will be emailed to your email account. If Mantis is setup so that the email password is not to be emailed, newly generated accounts will have an empty password."