योगी युञ्जीत सततमात्मानं रहसि स्थितः। एकाकी यतचित्तात्मा निराशीरपरिग्रहः ॥

yogī yuñjīta satatam ātmānaṁ rahasi sthitaḥ ekākī yata-chittātmā nirāśhīr aparigrahaḥ

Let the Yogî constantly engage himself in yoga, remaining in a secret place by himself, with thought and self subdued, free from hope and greed.

In plain words: Krishna says the yogi should practice meditation regularly, alone in a quiet, private place. He should keep his mind and body under control and let go of wanting and grasping.