There are 2 methods to do this and both have the same effect.
NB you only need to use one not both
- Open Farm Town,
- Right-click on the game and a menu will pop up,
- Find "Global settings" and click,
- A box will pop up,
- Find the button marked "Delete all" and click,
- Another box will pop up,
- Find the box next to "Delete All Site Data and Settings" and make sure it is ticked,
- Find the button saying "Delete Data" and click.
- It may take a minute or so but once that box closes down it's done.
- Now exit the game, close down your browser and re-open.
NB After doing this, the first time you open Farm Town (or any other Flash-based game) it may take a little longer than usual to open. This is a one-off and is normal after doing this.