Replacing the Wax Ring on Toilet, part 1
Signs that you have a Leaking Seal
If you have Dampness or water puddling around the base of the toilet in your bathroom. Or if water is leaking through and staining the ceiling below it is usually a sign that you have a leaking wax seal between the toilet and the drain. But before you replace the wax ring, do make sure the water is not coming from some other sources. There could also be a leaking connection under the tank or condensation on the tank may be dripping and collecting around the base of the bowl. Even a pin-hole in the drain pipe below the toilet may cause similar symptoms.
In any case, moisture around the base of a toilet is a problem that should not be ignored. It will usually not go away by itself, and over time it can cause significant damage to the subflooring around a toilet and the ceiling below.
Before you tackle this job yourself
Replacing a wax ring is not technically difficult, but the work is awkward, can be messy, and the toilet is heavy. It is not a job for a person with a bad back. 
Some professional plumbers wouldn’t think of doing this job without the help of a Toilet Truck. Sounds like a toy, but it’s really a special frame designed to do the heavy lifting that installing or moving a toilet requires.
We will cover the details of replacing the wax ring itself in part 2. Stay tuned!
I have a toilet that we are looking to remove and cap = can you tell me what i have to do to make sure the drain pipe is capped and stays capped ( will be under a new tile floor ! )
I assume your talking about the waste line.
At your local hardware store you can get an expandable test plug for about 7 dollars - 4 pounds.
Measure the inside of the pipe for the pipe size, it will either be 3 or 4 inch. If the pipe is black ABS plastic they have glue in test caps, about 25 cents, and you just break the center back out when ready to install toilet. If there is no problem with water backing up in it then just wad up an old towel and stuff in it, the only thing you are stopping is the odor from coming in the house and debris from falling in it.
Happy plumbing,