What does sub before any word means?? For example Inspector and Subinspector. Now Inspector being a boss will order subinspector to do certain tasks and subinspector will have to do this task to keep his job. :) similarly. Conscious mind is the boss. Subconscious mind is the servant of that boss. Even though subconscious mind is much more powerful, it's work is to obey the orders of conscious mind. Your question is How can we control subconscious mind. We are already controlling subconscious mind. We tell our subconscious mind that we are loser and it make us loser. We tell our subconscious mind that since black cat cross my road, it will be bad. and it brings bad things.

So in all means you and everyone else are already controlling subconscious mind. It's question of whether we should give it positive commands to bring positive results or give negative commands to bring negative results.So you can control your subconscious mind by giving a positive or negative command. Initially your conscious mind will not accept your command and will not pass it to your subconscious mind. For example if you can barely afford a cycle and you tell your subconscioud mind that I own mercedez benz. Now your conscious mind will not accept it and will say ," Come on! Are you crazy? Right now you cannot afford a cycle, how will you afford mercedez?, so forget about it", and your subconscious mind says,"Your wish is my command Let's forget about owning mercedez." so first thing is to convince your conscious mind to pass the order to subconscioud mind and it will make wonders.