[Danielle Roothooft]

I have this CS 5 photoshop now and it makes me crazy!!!
When I pick a colour with the picker in my doc. It takes the colour but put’s it on the background layer.
for example,
I am painting a tomato with red. then I pick yellow for my lemon, it puts the yellow on the back layer and my brush still paints red, then I have to switch the colours(on the double arrow), but then when I use my eraser, it shows the red from the background colour…..
I could work like this but it is so time consuming.
How can I fix this problem?
I have tried everything, but can not find the problem.

Danielle