The 6 peaks are identified by the markers along the top of the pattern. The software should give you values for those markers in 2-theta degrees (what is on the x-axis). If you don't have software use a ruler like we did before computers. These 2-theta values should be converted to d-spacings, either by using your software or by hand like we had to before computers - use the Bragg equation: nLambda=2d sin(theta), solve for d. Then compare your values with those in a database for your materials. Remember that relative intensity is just as important as peak position for identification.

You need to give us more information. Post your data, either as .raw file or .xy file or similar. Or post an image of your diffractogram.

           I've herewith attached my diffractogram. Please help me to identify my peak values.

The 6 peaks are identified by the markers along the top of the pattern. The software should give you values for those markers in 2-theta degrees (what is on the x-axis). If you don't have software use a ruler like we did before computers. These 2-theta values should be converted to d-spacings, either by using your software or by hand like we had to before computers - use the Bragg equation: nLambda=2d sin(theta), solve for d. Then compare your values with those in a database for your materials. Remember that relative intensity is just as important as peak position for identification.

Thank you mam for your suggestions

Get the data and replot in originlab. There u have many options. 

Here found a additional tool, find the attachment.