There's three help documents currently:

1. Why can people edit my posts? How does editing work?

2. How do I format my posts using Markdown or HTML?

3. Markdown Editing Help

If none of these are the specific "editing help" page you are looking for, then you need to specify what exactly you need help with.

There's three help documents currently:

1. Why can people edit my posts? How does editing work?

2. How do I format my posts using Markdown or HTML?

3. Markdown Editing Help

For comments, you need to refer to the Meta.SE post called How do comments work? and read through that on how comments work, including formatting.

If none of these are the specific "editing help" page you are looking for, then you need to specify what exactly you need help with.