Click the flood fill tool and fill your selection with a color so that it is a little easier to see. That is your basic Lasso selection tool. This can be used in photographs in just making odd shapes as well. Next, using the Lasso Tool still, change the feather number back to 0 and remove the check mark from the antialias box. Draw out another shape on your canvas.
Flood fill it with a color also.
I filled mine with green so it might be easier for you to see. 200 x 200, white bg and 16 million colors. Select the lasso tool again if it is not already selected. Don't worry about the foreground right now. You will understand why in a minute.