How can I increase width of some of the questions in order to make a 3 page form into 2 page form?

 How can I increase width of some of the questions in order to make a 3 page form into 2 page form?

You need to specify the fields that you want to be on the first page and on the second page, then you need to add or delete the page break buttons. 

Here is a guide with more information about multiple pages form: http://www.jotform.com/help/119-How-to-Create-Multi-Page-Forms. 

Hope this helps.