You play the bottom row (pits 1-6, your store is on the right). Tap one of your non-empty pits to pick up its seeds and "sow" them one-by-one counter-clockwise into the following pits — including your own store, but skipping the opponent's store.
If your last seed lands in your own empty store-side pit (and that pit was empty before), you capture it plus the seeds directly across from it into your store. If your last seed lands in your store, you get another turn.
The round ends when one side's pits are all empty — the other player keeps their remaining seeds. Whoever has the most seeds in their store wins!