From Qantas email:
To earn Qantas Points with BP Rewards, you must be a member of BP Rewards and choose to earn Qantas Points.
New BP Rewards members will earn 500 bonus Qantas Points when they successfully join BP Rewards and choose to earn Qantas Points between 2 July 2020, 12:00am (AEST) and 6 July, 11:59pm (AEST). Bonus Qantas Points will be awarded to the Qantas Frequent Flyer account by 17 August 2020
I just signed up and it seemed fairly straightforward.
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