I'm not exactly new, but for the life of me I cannot see how you edit a post.

When you want to edit, click the link to "report to moderator." Then, in the URL bar, change "reportar" to "editar." Make changes and click "submit."

For a short while after you post, up in the upper right hand corner (in the greyish bar above your post), there should be the word "edit". Click on it to edit your post.