How to use FullProf Suite toolbar for Rietveld refinement of XRD data?

I have some XRD data of my powdered samples prepared by sol-gel.The samples contain mixed phase of zirconium and silica. I want to apply rietveld refinement using Fullprof suite toolbar, but I am not able to find the right way to do it. Please help me to use the software.

If anybody knows some other software and the method to use that software, please tell me.