How to save ?

I like use the typewriter function.but ,when i quit,the mark cant be saved.
and prompt me to visit this site and get information. i think ,the typewriter funcition is very usefull,now i want to know how save it.


now i also have an advise:
if there is a pen that i can use it to mark the book freely,i think the software will be used abroadly.the function just like the painter in operating system.and the foxit should also has the save function,that i can read the book next time and find the important information.i am poor in english,could you understand me?[COLOR=DarkRed]