How do you practise mantra meditation?

Sit comfortably, close your eyes, and begin repeating your chosen mantra, either silently or in a soft voice, letting it settle into an easy rhythm. When you notice your attention has drifted, which it will, gently return to the sound without judging yourself. You can sync the mantra loosely with your breath if that feels natural. A few minutes is a fine place to start. StillMind can pace the practice for you, so the mantra stays effortless rather than something to concentrate hard on.