HI TELL ME PLEASE. i can not make a copper area on bottom, I making a square and it have only line
You will not get any copper area fill unless the netname of the copper area is that same as one of the nets in the schematic.
In other words if the netname assigned to the copper area does not match any of the netnames in the schematic then you will not see any fill in the copper area.
Please note that although you can get a copper area to fill even if the netname assigned to it does not exist in the PCB by setting "Keep islands" to YES, having a floating copper area is not recommended as it can cause problems with crosstalk
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