Image Registration of Sentinel-1 and Sentinel-2 products

By any chance could someone guide me to use SNAP to perform image registration on Sentinel-1 and Sentinel-2 products?

@charlesbrincat: do you mean snapping the Sentinel-1 pixel grid to the Sentinel-2 pixel grid?
Have a look at this graph to preprocess Sentinel-1 GRDH data and snap the grid to the Sentinel-2 one: