Need to remove Grace Period and add a line to my family plan. PLEASE HELP!

Highlighted
Groupie

Need to remove Grace Period and add a line to my family plan. PLEASE HELP!

I just switched to the $50 family plan and I tried to add a line but it keeps popping up with a "error with the system" message, so I read around and saw that it might be because of the 14 day grace period.
Is there anyway I can have the grave period removed so I can add a line?