Applying inverse kinematics in a hexapod with 4 dof

please if anyone could help me i need to know how to apply inverse kinematics and why do i use it .my project is a hexapod w ith 4 DOF in each leg??thanks

The less information you give us, the less we can help you.

So far I understand you have a 4dof hexapod. Thats it.
Knowing the Electronics would be a good start?
Im assuming at lot here, but given the info given I can only point you to a 4dof tutorial
lynxmotion.com/images/html/build171.htm

Your question I far to wide to give you what you require.