stuck in the tutorial..

[Andynski]

How can i put the fundament on the ground??

[Whimpy]

Click 'Built', select the type of foundation you want and click/drag on the marked area.

[grapplehoeker]

Select the type of foundation you want to use from the Build menu.
Choose an area of terrain and then left click and hold it... drag the footprint out to the size you wish (or can afford) and release.
For larger foundations you can then choose interior walls to subdivide it into smaller rooms.
Finally, designate the rooms to the type you want and furnish them first with the required items and then decorate it with decorative items.
The combined size of the room + required items + decor = Prestige
The more prestige a room has, the better your cultists/followers will like it.