For a ticker, go to someones ticker and hover over the ticker info over the top and when you get the pointy hand click and it will take you to the website and talk you thro it. You can't do half pounds on here so go up or down.
With regards to changing your information.
If you click "User CP" on the blue toolbar above you will access your details. Scroll down and on the left hand side will be "Change your details" you can change your weight there.
To get a ticker click here and follow the intructions then copy and paste the generated code (BBCODE) into your signature, which again can be accessed by your User CP.
When you create your ticker you choose a pin, you need to remember this to update your weight loss, you don't need to edit you signature on this site; just at the ticker factory.
You need 20 posts to have an avatar.
You need 50 posts to see other people's profiles (including your own).