I'm sorry! I've been busy for the past few weeks ðŸ˜
I may have misunderstood the question, so please let me know if this isn't what you're asking! For Scenarios, you roll 1d20 to determine which Scenario you will face first. Then, you roll to determine if you pass or fail. You determine which attribute is related to this Scenario.
And yes, +1d means rolling an additional 1d6