You want to make sure that you get the new seal on correctly before you reattach the toilet.
Toilet leaking under floor.
To prevent the porcelain from being chipped or cracked you should lay the toilet on either a blanket or a piece of carpet.
Water on the floor or a running toilet could signal the need for a minor repair a major one or even a new toilet and a few simple tests can help you decide which it is.
Approach the bolts from inside the tank and screw downward to create the best seal.
Apply the new wax seal where the old one as.
If they seem loose or you can see water gathering in that area use the screwdriver to tighten them.
Check the connecting bolts.
Push the new wax ring onto the toilet horn with the rounded side toward the toilet.
By far the most common reason for a broken seal is a toilet that rocks when you sit on it.
Under every toilet is a large round wax seal.
This wax ring seal is positioned between the toilet and the floor.
Frequently a toilet leaks simply because the wax ring has lost its seal.
When a toilet leaks water from the bottom base on the bathroom floor you most likely have a worn out wax ring seal.
Mark the water closet bolt positions on the floor with masking tape.
This is to prevent sewer gas and other bad smells from escaping into the bathroom.
If the subfloor is spongy under your leaking toilet the toilet may have started to wobble and the problem is quickly going to get worse unless you make a fairly major repair.