https://sheriff-o-matic.appspot.com/help-som is general help for sheriff-o-matic.

There's also a help link at the top of the page that we can configure.

Would a screencast of me doing some sheriffing help? 

I think the help page could benefit from a small tweak.

How to Sheriff
--------------

Your main goal as a sheriff is to keep the tree you are sheriffing open and green, so that people can submit changes. The alerts on Sheriff-o-Matic represent test failures, which can cause problems for the tree. 

(new) As sheriff you should look at each alert as it comes in, and try to fix the issue. This is generally done by either reverting an offending CL, if one can be found, or by filing a bug and investigating.  Sheriff-o-Matic provides context surrounding build or test failures, such as ranges of relevant commits, to help you determine the cause of a failure. 

For more information about sheriffing, see: https://www.chromium.org/developers/tree-sheriffs

Screencast would be awesome, but I worry it would be hard to keep up to date. Screen shots go out of date pretty quick already.

I agree that a screencast would be nice but quick to get out of date (we change the UI reasonably often). But if it's not much work to do, maybe it could be worth doing anyways. 

Not working on this anymore.

 Issue 686898  has been merged into this issue.