You must be a WoW member to boost or un-boost a Page post. For more information on HeyJinni WoW booster click here.
To boost, navigate to your Page > Find the post(s) you want to boost > On post select dropdown anchor > Select Boost Post.
To un-boost, navigate to your Page > Find the post(s) you want to un-boost > On post select dropdown anchor > Select Un-Boost Post.