Import of a plan (blueprint)

[KandW]

To familiarize myself with Sweet Home, I drew the outline of a room as a test, scanned it, and then imported it into Sweet Home.
In the first step, the scale is defined. In the second step, which I don't understand, it says in the wallpaper wizard. "Define the position of the image by marking it with a click or by changing its coordinates".
Can someone please explain the meaning of this information. Thanks very much.

[Puybaret]

It’s just used to place the image according to the origin of the plan.
But don’t really bother with that step, moreover in the Online version where there’s no ruler along the plan borders.

[KandW]

M. Puybaret: Merci beaucoup pour votre information. Le programme est très bien. Je l'ai utilisé il y a plus de 10 ans quand j'avais 70 ans. Maintenant, je dois réapprendre quelque chose. Bonne chance - restez en bonne santé. KandW de Bad Schwalbach, Allemagne