Can I change the price after I’ve published?

No. Once a Paid Linkup’s Joining Price is set, it can’t be changed. That way everyone who joins pays the same price they saw.

If you set the wrong price, cancel the linkup before anyone joins (or as early as possible), and create a new one with the right price. If people have already joined, let them know in the group chat first. Cancelling releases their payment.