To update the price of your post, follow these steps:
Navigate to the post you want to edit.
In the upper right corner of the post, click the pencil icon and select Edit from the dropdown. This will open the Post Builder.
Go to the Settings block, where you'll find the pricing section below the hashtags and description fields.
Enter the new price in the pricing block.
Click Next and review your post to ensure everything looks correct.
Click Save to make the updated price live.