If you don't already have a project, click File -> New Project. Select the name representing your design.
Go back to the main KiCad menu and click on PCB Editor (the green one).
The PCB Editor looks like the screen below:
Near the upper right of the PCB Editor screen is an icon of a chip. That is the Add a Footprint tool. Click it and you get a window to select a footprint. Select your footprint library and your design.
Place it in the center of the PCB editor window.
Zoom out if necessary to see your entire sheet.
In the 3D Viewer (View -> 3D Viewer), you can see your front design.
You should save your design into a project file and the PCB file will have a .kicad_pcb file extension.
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