Ground plane erstellen, aber wie?

Thank-you Old_Grey!
I've tried exactly this several times before with no success. Maybe someone will try this procedere on his/her machine and will report here.
Btw. after selecting a part in PCB view and right.clicking a ground pad the popup box dosen't show "set ground fill seed".Iit just shows "order", airwire, delete.
Maybe something is wrong in my schematic. All ground connections are tied together and connected to one ground symbol "Ground1" from inspector.
Thank-you for patience