Login to the OARSI website, www.oarsi.org
After logging in, you will see the blue 
icon on the top left hand side of the page.
Select the icon.
The page will slide to the right revealing your name and a list of tabs.
Select "My Profile"
On the right side you will see a blue 
button, select it.
There will be three tabs, My profile, My bio/photo, My account.
To change your password, select the My Account tab, then Edit password.
You must enter your current password, then a new password. After completing this, select Save. Now your new password is activated.
The other two tabs will allow you to update your contact information.