Update editing guidelines. Fix #38

docs/moderation-edit.md

@@ -1,8 +1,27 @@
 ## Editing content
-Content that is already published can be edited through Github.
+Content that is already published on RAH can be edited through Prose, an easy to use content editor for content stored on Github.
 
-## 1. Go to project folder
-On Github, go to the appropriate project folder https://github.com/WorldBank-Transport/rah/tree/master/app/assets/content/projects
+## 1. Go to Prose
+Go to Prose and navigate to the appropriate project folder: https://prose.io/#WorldBank-Transport/rah
+
+![](images/prose-file-list.png)
+
+The first time you log in to Prose, you may have to provide access to your Github repositories.
 
 ## 2. Edit the index.md
-Edit the file and make changes to the content. Once you're happy with the changes, choose the commit them.
+Open the file `index.md`
+
+## 3. Edit content and metadata
+Each project consists of a main content block with a description of the analysis and corresponding metadata.
+
+Edit the main content block:
+![](images/prose-main-content.png)
+
+The metadata pane can be accessed through the metadata icon on the right side:
+![](images/prose-metadata.png)
+
+### 4. Commit changes
+Once you're ready to publish your changes, hit the save button on the right side. You'll be asked to provide a description of your changes.
+After you hit commit, it will take a couple of minutes for your changes to be published to the live site.
+
+![](images/prose-commit-changes.png)