By search box on SNAP’s GUI I still can not find how to add coordinate and axis around the picture of my geocoded “Unw_Phase_ifg…VV” bands data. Where is this important tool?
can you explain a bit more what you mean by “add coordinate and axis around the picture”?
Probably you want to add the Graticule to the view:
After it is added via the toolbar it can be selected in the layer manager and the properties can be changed. The defaults can be edit in Tools / Options -> Layer / Graticule Layer
Unfortunately the labels are not well displayed on higher resolution images.