Hi Amanda,
Firstly, welcome to the forum!
I’m sure you should have been able to pick a forum name when you signed up. I think the process may have become less obvious though as there have recently been a lot more usernumber sign ups than there used to be. There was a discussion about it recently in The Sandbox
Anyway, to change your username you need to email customer care. From the Welcome to the Lovehoney Forum. Please read before getting started! thread:
Changing Your Username
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:
I would also have a read of the Welcome thread as it has lots of useful information on navigating the forum 
.