This is the third RP example, and it's on posting OOC Side Notes. All you have to is type OOC: and then whatever you need to type. This is how I talk to the other members without messing up my posts, and also, be sure to put ()'s from the Start and end of our note. For example:
(OOC: Hey, sorry but I got to log off. I post back tomorrow! xD)
It doesn't have have to be in specific spot. You can put it before or after you In-Character Post.
There's also when you have a thread that inter-links with another. When that happens, please say Takes place after ... and then the name of the past Thread in Italics.