I don't know if there is a guide-book to the Fluids, but I can give you a crash course, if you want. They aren't as difficult as they seem at first glance.
Also, you don't have to reply like a letter. The device automatically adds your name at the top. Or, a name you've picked for yourself like mine.
iii. Text, UN: Mallrat Supreme
I guess your name is Dimitri. Mine's Jubilee.
I don't know if there is a guide-book to the Fluids, but I can give you a crash course, if you want. They aren't as difficult as they seem at first glance.
Also, you don't have to reply like a letter. The device automatically adds your name at the top. Or, a name you've picked for yourself like mine.