How do you unlock home in farmville?

i have a farmville account on Facebook and ever since they came out with the English Countryside farm i have been farming on there instead of my home farm. and now they opened up a craft shop so once you harvest a certain amount of crops then you can get a material that will help you with building things. but whenever i go to the market the specific crop i need is locked to home. and it says you must be at your home farm and you need to unlock home to use this. how do i unlock home?? i have tried multiple websites but none of them have the answers i need. please help me :)