1. Rename either "Fence1NoFlowers" or "Fence1WithFlowers" to just "Fence1" (keep the .xnb as is)

2. Place file into the LooseSprites folder

3. Load up your game, the new fence should replace the wooden fence. 

You can rename the fence to "Fence2", "Fence3", or "Fence5" to replace a different fence. 

Enjoy! 

-poopmissaccio/Seph