Hi Deepa,
an example model with the InitPoissonDisc initialization of the cell arrangement is attached, together with result movies for the spatio-temporal dynamics of planar cell polarity propagating over the (here frozen) cell arrangement and specific cell configurations and contact lengths among neighboring cells affect the PCP pattern and cause variability. The InitPoissonDisc plugin is in the model section CellPopulations which defines the initial cell arrangement.
In general, you can add plugins to your model in the GUI in three ways (click the "+" button above the model editor panel, right-click and "Add" from the context menu, or double-click on the plugin name in the panel names "Model components"). Note, each list of available plugins will be automatically filtered depending on the position of your cursor in the model.
Best,
Lutz