Draw circle on Photoshop

I use Photoshop to open a png file and want to add some circle on the image file.

When I draw a circle and select copy and paste, another image is created but they are moving together as a unit. How to separate it ?

How to select a circle ? I click on the circle but it can't select ?

Thx
Simon LeungAsked:
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KimputerIT ManagerCommented:
I suspect you copy and paste inside the picture. If you want to keep it separate, use layers, or vector objects.
Shaun VermaakTechnical SpecialistCommented:
First add a new layer (Shift+Ctrl+N)

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