The AWL signature does not accept the [URL] code. This is probably for security reasons.
Go back to your Ticker Factory page, and display the code for your ticker again. Extract only the IMG code for your signature:
1) Go to your page at http://www.TickerFactory.com/weight-loss/wQ18xp3
2) put in your (hopefully recorded!) pin number in the field provided then press the "Code" button The BBCode that you need to copy will be shown in a little box
3) Copy the text between, and including, the two IMG tags: "[IMG ...TEXT... /IMG]"
4) Open your signature in your profile control panel
5) Paste your new code over the existing contents
All your future and previous posts should now have the correct ticker image.