Welcome back again 
It used to be very hard on the old forum, it is much easier now.
Customer Care can change it (from the Welcome to the Lovehoney Forum. Please read before getting started! thread):
If you wish to change your username you can pop a request in to Customer Care by sending an email to customercare@lovehoney.co.uk.
Please include:
Your current username:
Your prefered new username:
Name:
Email:
DOB or Postcode:
Reason: