Okay this is the Post Office game. Here's what you have to do:
Type letters,(eg. Dear Jacob, You suck) and act like you are the person. You can change from person to person replying to the person above you.
here's an example:
Dear Bella,
I love you more than anything in the world. Run away with me and Renessmee.
Love for eternity,
Edward
Dear Daddy,
Where will we go? Can Jacob come too???!!! Please let Jacob come!
Love Nessie
Everyone get it? well too bad if you don't.
Here is the starting one.
Dear Jace,
Please, please can we go up to the garden!? Who knows what we could do up there...
Clary