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1. Select the layout with which you want to  associate the map  in the layouts ribbon or create a new layout (see Creating and deleting layouts and Selecting a layout for editing).
2. Switch Go to map view editing mode (see the section Opening and closing the map)
3.  Switch Go to an existing map that with which you want to attach to associate the layout , or create a new map (see the sections Switching between maps and Creating a new map).
4. In the context menu of the layouts ribbon, select Save layoutSave changesand exit layout editing mode (see Exiting layout editing mode).

After you save the layout, its icon resembles than shown in picture below.

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