to create an account, please visit the "team" in the left sidebar. when there simply click on the "add member" button which will generate a popup for you to fill in the info of the new user you want to invite.
![Team (1).png](https://cdn.steemitimages.com/DQmWnPpE3c7XSjCnThXnzpYnDhuvmjmLYQShqafjhpfReCd/Team%20(1).png)

the demo uses ethereal.email as email STMP server so no emails are delivered to the real addresses - instead they are caught to ethereal.email's own email servers. my ethereal.email account details are  on the [Github](https://github.com/peerquery/curator) page of curator. log in to [ethereal.email/messages](http://ethereal.email/messages), and see all emails from the demo there.

now click on the one you sent, and follow the sets in it to activate your account and that's it.

On the second question of post submission, you do not submit anything to curator. a curation service will stream content directly from the blockchain - by category, author or app. so just write your post from any client using the target category and the curator will automatically catch it - there is nothing to submit.

if a curation is curated by author(eg: multi-author blogs such as @adsactly), then only posts from the author account will be curated. if the curation team is curating from an app such as steemit or busy, then you would have to create your app from those app.

i hope this clarifies some of your concerns. i am putting together a second post to further explain Curator. thanks for your interest!