I need help downloadin new version of flash player. I cannot retrieve old password; therefore, can't change the password.

I have not been able to retrieve any videos for a while because the system is telling me I need to update flash player.   When I am asked for password, I do not remember it;   When i get to "forgot" password, I cannot get it changed.  I have talked with tech support twice.  They told me both times to bring the computer into retailer (Best Buy).  I physically brought computer into best buy and was told I had to contact Adobe directly.  I can't get into that system--period!  I called best buy again and was told to go to Adobe.com (again).  How do I get help with updating flash player.  I am very frustrated.  I have a MAC OS X.  Please help.