Put png map image as a background to draw upon [duplicate]

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I have an image of a fiber optics network map, like this one

I want to turn this map image (without any actual GIS data) into a vector map where each point is defined by lat, long.

To do this, I'm trying to import it in QGIS. I'm using the OpenLayers plugin to have Google maps as a basemap layer. I have an empty vector layer with projection set to EPSG:3857 where I want to draw the points.

I can't import the image and position it correctly over the Google Maps basemap.

Here's a sketch of what I want to do (shopped, not an actual screenshot)





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