The freeze plug location on a 2001 Chevy Blazer varies depending on the engine. There isn't one single location. You'll have multiple freeze plugs throughout the engine block. To find them, you'll need to consult a repair manual specific to your Blazer's engine (e.g., 4.3L V6, 5.7L V8, etc.).
A repair manual (either a physical book or a digital version) will have diagrams showing the exact location of all the freeze plugs. Trying to locate them without a diagram is difficult and potentially damaging to the engine.
