Practice simple Taiji movements such as the opening movement (Commencement) repeatedly and pay attention to your breathing, i.e. inhale for opening movement and exhale for closing movement, you can feel the Qi flows within your mind and body. If this is difficult for you, use natural breathing initially.
Your movements should always be continuous and graceful. Lift your foot like a cat. Move your hands like clouds.
Keep practicing and you will feel it!