new to photoshop

[Complete]

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.

 

[Luna]

Make sure your image is in RGB mode. You can define this when you create a new image, or edit it in existing images (thought I don't recall what menu it's under).

Can you see the full color spectrum when you try to select a color?

 

[Cosmin]

www.good-tutorials.com

 

[Midnight]

What version of Photoshop do you have? I've worked with 8.0 and Elements 5.0