Video tutorial :

Ch an odd number of sts.

Row 1: Dc in 5th ch from hk ,dc in same ch, *sk 1 ch, 2 dc in next ch; rep from * across to last 2 ch, sk 1 ch, dc in last ch, turn.

Row 2: Ch 3 ,2 dc btw next 2 dc group across, dc in top of t-ch, turn.

Repeat Row 2 for pattern.