Thank you for your question.
I am sorry you are having a problem with the snow blower. I see that Joseph P. has given you a link to an answered question on removing the wheel. If the tire is just flat, you might be able to be inflated. Usually when the tire has leaked, all the air out it is because the bead does not seal very good to the rim. First, I recommend using a bead sealer on the rim and the tire. This will help seal the tire to the rim. To get a tire back on the rim use a ratchet strap wrapped around the tire. When you start to ratchet the strap tighter the bead will start to push outward to the rim. Now put some air in the tire to seal the tire to the bead. Remove the strap and adjust the tire pressure.
You can also just use a piece of rope and a stick; hammer handle, etc. to make a tourniquet. Twist it up until the rim seals and add air. The ratchet tie down, if you have one handy, is a better method, though.
To repair a leak in a tire I have use a tire sealant with the brand name of slime that has worked well. You will have to place a block under the frame of the snow bower to take the weight off the tire. If the weight is on the tire, it is more likely to come off the rim. Now remove the valve core from the valve stem and squirt in the recommended amount. Clean the excess off the stem and reinstall the valve core. Inflate the tire to the recommended pressure. Plugging the tire with a tire plug kit will also work. You can check out this link.
Here is a link to order any parts you need.
Sears Parts Direct
Please let me know if you need further assistance on this issue.
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