Rinse the pearl couscous under cold water in a fine mesh strainer and set aside.
Add the rinsed couscous and vegetable broth to the Instant Pot. Close the lid and ensure the steam release valve is set to 'sealing.'
Set the Instant Pot to manual high pressure for 5 minutes. Once the cooking cycle is complete, perform a quick release by carefully turning the steam release valve to 'venting.'
Fluff the couscous with a fork and let it cool slightly in the pot for about 5 minutes.
In a large mixing bowl, combine the cherry tomatoes, cucumber, red onion, black olives, feta cheese, and parsley.
In a small bowl, whisk together the olive oil, lemon juice, dried oregano, salt, and pepper.
Add the cooled couscous to the vegetable mixture and pour the dressing over the top. Toss everything together until well combined.
Serve immediately or refrigerate for 30 minutes to enhance the flavors.