Rebeca, I did as advised (WGS84 with Pseudo Mercator), it now shows all the options (km, m, miles, etc) to buffer a point – but something is not right.
I buffer a point with 5000m and when I mesure it (because it does not cover the area expected) it gets a circle with about 4,500m.
I have validated the map registers well point coordinates – I copy a point from other map and it gets correctly pasted in this map.
Do you have an idea of what is happening?. Thanks