Ah, should have noticed the @poshtoken comment earlier, lol.

tl;dr on reward.app, you set a % of the post you want liquidated, for instance for you you would place 59% to reward.app and the rest to the authors contributing to the content of the post. reward.app will take this 59% and return it in liquid Hive and HBD rather than Hivepower and HBD. There is a fee to using the service but 1% is not a lot, it does also have another feature where curators can get extra incentivized to curate your posts as we wanted to see how promotion on posts could work this way now that we have downvotes if it becomes abused, but basically you just send it a memo with the number 0 to 100 of how much of the benefecator rewards you send it you want to go to curators. In this case it would be 0 as you want to liquidate all of the rewards and keep them.

so a shorter tl;dr:
sent reward.app as beneficiary of the amount of rewards you want liquidated on your post (example 59%)
send reward.app a 0.001 memo with the number 0 to not send curators extra rewards