To add a door to your design in the Floorplan view, follow these steps:
Go to the Floorplan view of your design.
Click on the "Door" option, which is available on the Home ribbon or the Architecture Ribbon.
A default door will appear, attached to your cursor.
Move your cursor along the wall where you want to place the door.
Once you've reached the exact location where you want to place the door, click once to insert the door into the wall.
Select the door again to make any changes to the door to the door size, location or model.