help with selling fish

Hello
Can some one help me and tell me please how I sell fish?????
My tank is full but can not figer it out .

If you haven't already done this, you need to move some fish to the selling tank by dragging the fishies to the "tab" for the selling tank in the upper right corner of the screen (Sale Tank in the Windows version, Tank $ in the PDA versions). Then click on the Sell Fish button. If you're playing the Windows version, there are some good pointers in the Help screens, which are accessible from the Menu.

Thank you very very much ladycfii