Being new to all this I am not at all sure that this is the appropriate means to raise the matter but I have been asked by my publisher to highlight a promotion on Bookhippo of my novel Brunette. For a period of time it will be free on Kindle in preparation for a new novel coming out. May I ask, how I do this? Thank you.

Certainly. Please go to 'Author Tools' -> 'Request a Feature' and follow the instructions.