Rim Blow Steering Wheel Help

I just came over from the a-body site and need help/advise for removing/pulling a rim blow steering wheel. I have a '70 cuda and have to get the rim blow wheel off in order to restore the steering column and dash. I can't figure out how to remove the center pad to access the shaft. It's my first time attemping this and I thought I better ask first so that I don't damage anything.:confused: Your help is greatly appreciated.