Ok, am I blind, do we actually have this somewhere and I don't know where to look (which is a problem in and of itself)?

Where are the instructions on how to use all the various features that the privilaged few have?

How do you replace a thumbnail of a video if you are not the video creator?
How do you provide an alternative embed?
How do you tag Amazon items?

How do you do all these things? I know they can be done but I'm buggered if I can sift through all the old sift talk posts to find the one announcement of it that says how you do it.

Come on guys, a bit of doco wouldn't go astray.