Instant Pot Salmon Clam Chowder

Name: Instant Pot Salmon Clam Chowder
Ingredients: 2 6.5 oz cans clams (Save the clam juice); Water (to add to the clam juice); 4 Tbs butter; 1 onion diced; 2 stalks celery; ¼ tsp thyme (or 2 springs of fresh thyme); 1 tsp pepper; 1 tsp salt; 3 cloves garlic (pressed, or minced); 1 ½ lbs potatos (I used a medley bag of baby potatoes and it was a 1.5 lb bag, skin can stay on); 1 ⅓ cups Half and Half; 3 6 oz Salmon Filets (boneless, and skinless); 1 ½ Tbs corn startch or potatoe startch (optional, for thickness)