Just click on your ticker from any post you have made. That should take you to the ticker factory site of your personal ticker. There you can enter your PIN, click "Edit/Update Weight Data" and it will take you to the page that allows you to enter data.
BTW, don't push enter/return after entering your PIN - if you do, it takes you to the pages to create a new ticker. [<<< although this is inconsistent. Sometimes it takes you to the right place....
but many times I have made this mistake and ended up at the new ticker page]