help for making a minimum rig

i began working on a very simple rig for a human

see pic
now here the Hip bone is still part of the IK chain i guess
so when it moves then all legs bones are moving with it

so how do you stop this IK chain
i mean in which panel and it it in pose mode or edit mode that we can do this ?

appreciate any help

Thanks

A simpler way to make a basic rig is to just import a BVH file and throw away the keyframes.

where can you get these bvh files
and how do you get rid of frames?

i tough it would be simpler to use the little rig i did there which is mostly complete
except for hands and feet but i can take care of that afterward
with other examples i have already

Thanks