When you create a post (I assume that you use Hive.Blog) then underneath you have "Post options:", then "Advanced settings", then under "Author rewards" you can change the default "50% HBD / 50% HP" to "Power Up 100%" and click "Save", or click "Update" and in your "Preferences", under "Comment post rewards" you can change it, so it will be your default for posts.
(However, please keep in mind that this settings is saved in your local storage so it's only effecting on that particular device you are using)