If there is silcone between the bowl and the floor cut it. Holding the knife parallel to the floor so as not to damage the flooring drag the blade around the complete circumference of the bowl. Lift the bowl straight up while straddling it and set it on a piece of cardboard or plastic. Scrape away the remnants of the old setting seal from the bottom of the toilet and from around the 'floor flange' that the toilet bolts to and set the new seal into place. I prefer to set the seal on the floor and set the toilet over it.
Many people stick the seal to the bottom of the toilet and then set it over the hole.
When re-setting the toilet be careful to tighten the bolts slowly and evenly until the toilet is snug to the floor. If these bolts put up much resistance, stop. Hook everything back up and try to tighten the bowl a little more in a day or two. Click the classy commode to return to the 'main' toilet page.