Crash Course in the Basics of DWRPing
Okay, so doing RP on Dreamwidth is very similar to RP on LiveJournal, if you were around that corner of the internet back then. If not, I got you fam. Heads-up, I use the terms "journal" and "account" interchangeably- they mean the same thing.
Open-Ended Prompts
And a character's comment, called a top-level, is cherry-picking what they want to work with from those options, and would be one comment to the entry including all of something like...
So the important thing to keep in mind with top-levels, especially when there's a bunch of them around, is that they don't have to mutually exclusive between characters. It's generally poor form to have your character respond to more than one prompt from another character (unless it's exclusive to them, which is fine!) but the only thing stopping your character from throwing a reply at every character with a top-level in the bunch is your own mental reserves and free time. It might be easier to start smaller with 2-3 threads at once to test what your limits are, though. And it's not often mandatory to write a top-level set of prompts, sometimes it's funner to just rise from the depths and hit the threads that really give you a fun feeling. There are no wrong answers with this, but be willing to put yourself out there.