Not sure what you mean:
There is online chess and also live chess. Both of them certainly have clear options for setting paramaters.
In online, click "start new game" then just select everything you want from the menus. In live chess, you have to click the "new game" tab and once again there are a bunch of options to choose from. Is this what you were after? 
Go to your online chess page.
Near the top right hand corner you will see a menu, choose Start New Game
All the options can be set there, including rated/unrated, opponent rating, etc
Hmm, thanks. It doesn't seem to give me the option to set the min and max rating levels of opponents.. I've changed this in settings...
I don't seem to be able to 'advertise' for an open game - within set rating paramaters that is, or is clear to me, that it is a rated game?
i.e I want to play rated games - against people who are rated between about 1100 - 1400. How do I do this? Don't seem to have all these options open to me..?
Thanks