I cannot uninstall flash player, please help

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Hi, I cannot install flash player in my mac book pro. When I clicked uninstall botton from Adobe flash uninstaller( which is already download in my Mac), there is a small box pop up"Adobe Flash Player Uninstaller is trying to install a new helper tool", then ask me  to enter User name and passowrd, on the right coner of the box, there is cancel or install helper icon, I tried many time of the password, it doesn't work and I cannot uninstall the flash player. 

could you please help me because i tried to do these thousand times already!

Thank you! 

Rui 

[Nancy OShea · Accepted solution]

Your Apple operating system is asking for your Mac user/password. 

[Nancy OShea]

I should also add that you need a computer user profile with administrative permissions to uninstall software.