Doing this:
Qt Code: 
  1. uic3 FORM.ui > FORM.h
  2. uic3 -impl FORM.h FORM.ui > FORM.cpp
To copy to clipboard, switch view to plain text mode 
or this
Qt Code: 
  1. uic3 -convert FORM.ui > FORM4.ui
To copy to clipboard, switch view to plain text mode 
are two separate approaches to the same problem. The second approach is the neatest. List the new ui file in your Qt4 project's PRO file FORMS variable. Then create the QWidget-derived wrapper class to use the form as described in the docs Santosh linked to. It is not magic, not completely automatic, not devoid of required understanding, and it is not without a level of effort on your part.

Once you have done that... if you strike problems then ask an intelligent question containing some information on what you have actually done, actually seen, and expected.