Please can anyone guide me , how can I align my pages in the center of the screen in the Montezuma theme..?

what is your URL?
are you using a responsive grid setting?

The url is webdragon.uni.me
I dont know about the grid setting.
How can I check that ?

I don't understand, your page is aligned to teh center of the widnow. What are you looking to do?

Please have a look at it now. i have removed the widgets from the right side. I dont want them. I want my text of the page to be in the center of the screen. Is it possible ?

when you removed the widget area, did you increase the number of columns of the content area? Have you read thru the onscreen documentation explaining the grid system?