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Enter the building address. Each link opens a targeted search in a new tab. When you find a plan: right-click → Copy image, come back here and press Ctrl+V (⌘V on Mac). Or save it and drag it onto the drawing, or use Photo / PDF / image. PDF plans load directly.
Tap or drag the four red corners onto the corners of the plan (or the sheet of paper), then Apply. Use Rotate first if it is sideways. This squares up photos taken at an angle so rooms can be detected.
No drawing needed: list each room on this floor with a rough size and where it sits. The app lays them out around a corridor as a tidy block plan (not to scale). Then drag walls or corners to fix anything, and use ▦ Zone from rooms to make zones.