When you registered your student in the Leon County School District, you should have been sent a letter with information about accessing FOCUS, the district's official student database and communication system. You will need the pin number provided in that letter to register for a FOCUS account. If you never got that letter, or have misplaced it, you can contact Cobb Tech Con "Dr. B" to request another copy.
Once you have the FOCUS Parent Portal letter and pin number, you can follow the instructions given here to register your account.
Access to the Parent Portal website is available here.
There are mobile device apps for FOCUS, but you will need to register your account using a web browser before using the mobile app.