To sign into ForeFlight Mobile on your iPad, go to (1) MORE > (2) ACCOUNTS > (3) HAVE A SUBSCRIPTION?...SIGN IN and on the next page (4) Enter your email address and password and then (5) Select SIGN IN.

Images 1 and 2:  How to sign in on the iPad.

 

To sign in on the iPhone or iPod Touch, go to the MENU and select (1) ACCOUNT.  On the next page (2) enter your email address and password and then (3) select SIGN IN.

                   Images 3 and 4:  How to sign in on the iPhone or iPod Touch.