Oh, if that article doesn't help, tagging is simple: With every photograph you upload load, there is field called tags underneath the story --- the rules to tags is about keywords/phrases eg:
food market, bag, beans
each keyword/phrase is separated by a coma and you can only use alpha-numerals (words and numbers, no punctuations are allowed).
There are no limitations to what you can use as keywords/phrase it's upto you.
Hahaha Ntsasa I wasnt buying anything, I guess its part of some work I am trying to put together about everyday things I see and places where the subjects have a story to tell. I give myself projects of things to shoot and its been fun - thats why I cant wait till we all go out and shoot themes it will be interesting to see what we all produce.