When asked to post something, log into the site, go to the ‘dashboard,’ and follow these instructions:

1) be sure you’re in the dashboard
2) click add new under ‘post’
3) give your post a title
4) type your response, upload your image, copy your embed code, etc.
5) click the box for the appropriate category (in the image above it’s ‘blog/responses’ but it could be whatever is appropriate)
6) hit publish

And that should be it!