You can find this information in the FAQ link at the bottom of the page:
"How do I change my goal weight?
Go to your "My FatSecret" page and in "my toolbox" box click on "my diet". Once there click on "change goal weight" and you can enter a new goal weight."
Someone who is busier than you is working out right now.
There will come a day when you can no longer do this. Today is not that day.