how do i remove the front lower arm from the chasis ?

Are you talkig about the lower a frame if so you have to take off the shock and rent a spring compressor and compress the spring , I jacked my car up supported it with 6x6 wood blocks and took the front tire off so I could gtet to tthe spring after toe spring is secure you then pup thte ball jonits of and the a frame should drop there are two bolts on the frame you will then take out and the a frame will come out.hopes this helps Bob M