Follow the steps below to remove the augers on you r snow thrower. I am also including some images to help you (see images below).
Remove the belt cover.
Remove the chute control.
Remove the auger control cable.
Remove the 4 bolts that attach to thrower head to the drive (2 on each side). You will need help the drive will want to fall backwards.
Remove the drive pulley on the thrower head.
Remove the bolts the bolts that hold the flange bearing in. These are on the end of the auger shafts.
The whole auger and impeller assembly should now slide out.
Remove the shear pins and the augers should slide off of the shafts.
When the parts are replaced reassemble in the reverse order.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
I have included a link that you may use for parts purchases; please click the following
Sears Parts Direct
If you require further assistance please resubmit question with details of what you have done. I will be looking forward to helping you again in the near future.