I have a few vps running. And sometimes i put more. So i need this cause half of them stop over night. But i am too noob of linux to understand how this work

I mean i cant edit. I tried vi the file but then i cant do anything else How do i edit?

Btw i am using putty so i am always console mode.

also:

1.Do i really have to change the catalog that this stores the log files?
2.What about the network interface... i am confused 
3. 4. 5. How do i edit !?


Thanks