Guys guide me about proxy using..

Guys please guide me about proxies using. I am newbie in proxy using.
My questions:-
1.> How can I use one proxy on few selected sites at same multiclicker.? Like this screen shot.
[Only registered and activated users can see links. Click Here To Register...]


2.> How can I use few proxies at same site plugin in same Multiclicker.?
Like this screen shot.
[Only registered and activated users can see links. Click Here To Register...]

Please give me step by step instruction Please.