Your community password in community.tu.org will start out as you membership ID number. When you click on the Sign In button, in the upper right corner, you will simply use your membership email address and password (member ID number) and then click on Login. You can then change your password under Profile then Contact Details and then Change My Password.
Your password on the main tu.org website has not changed. Log in with your existing username or email address and then password.
Pro tip: You are welcome to make your community.tu.org and tu.org passwords the same, but be sure to change them occasionally for added security.