HI NAAZIRA
There are few steps to do it:
1.Select the Report tab in the Project layout window.The Report window appears.
2.Click the Opti2DGraph button on the Report toolbar and draw a 2D graph in the report window.The 2D graph appears in the Report window.
3.In the Project Browser, select the parameter you wish to plot , and drag it to the 2D graph X-axis (a grey triangle appears in the graph in the bottom right corner).The graph appears in the Report window.
4.In the Project Browser, select the Min. log of BER result from the BER Analyzer component, and drag it into the Y-axis of the graph (the grey triangle appears in the top left corner).
The result is plotted in the graph.
For further please refer to
Thanks and regards