thanks for your coments and assistance. apparetly, according to wordpress admin, the only way to allow others to post to a wordpress blog is to invite them, and add them to a list.
so, what i’m going to do is post a writing prompt – a quote, a line from some other work of fiction (or non-fiction), a passing thought, a question, whatever comes to mind. then, those who want to respond, can leave some bit of writing inspired by the prompt as a comment.
if this works – if peole actually do respond – i will send out those invites and add people to the list of approved contributors, and then anyone can just submit writings willy nilly. and we’ll see what happens.