I am a little confused as to how they work... when you post on a story do you also use the pervious poster's character and the others characters or do you just use yours...cuase a long story only useing your character would be hard...also are there any rules when useing someone elses character in your post?

To be a little more specific (nice work though Renji ). When you are posting on a story, you generally do character development and move the story along a bit, or you make the story a little juicy. Like you make things happen for example:

Rike was walking alongside Luckystar when he heard rustling in some nearby bushes. He pt his hand on his weapon just in time as Rebel soldiers started streaming out of their hiding places. Before they could do anything, he opened fire and rows of rebels fell to the ground.