Just starting out

I am really just starting out.

I am used to a different more limited paint software package.

So doing simple stuff in Photoshop is new to me.

So, if you will, can you help me with the easy, simple, basic stuff? I have started a tutorial and it tells me to draw a solid green shape. I thought it would be easy. This is how far I got:



When I clicked on the color square it presented me with a dialog box to select a color. I tried everything I could think of but it only gives me shades of gray.

Chances are the document's "color mode" is grayscale.

Go to IMAGE>MODE and change it to RGB