To access your organization's TimeToSignUp sheet(s), you should have received a web address in the form of http://www.timetosignup.com/organization. This allows you to directly access your organization's sign up sheets. Please contact your organization to find out the direct address of the sign up sheets.
If you can't find your organization's sign up sheets, you can use the sign up sheet search tool.
If you signed up for items but can't remember what you signed up for, you can use the find my items tool.