antifreeze leaking into the oil pan
depends where the leak is, and how bad it is.
You have to determine the source of the leak then decide on how to fix it.
You will have to locate the source of the leak before you can fix it. Re-post with your findings.
Pressure test system to determine where leak orginates to determine fix
Find source and fix it.
Replace the thermostat gasket.
by getting a Bars Leakradiator leak at walmart
Have cooling system pressure tested to determine origination of leak
How to fix this depends on where specifically it is leaking from.
Coolant leak, possible heater core. Suggest to have it pressure tested to find leak.
It is possible. However, it will be a temporary fix.
A part has failed. Find where the leak starts, and fix that part.