You cannot change your username, however, we do allow display names (in your case "love") to be changed on occasion, if certain criteria are met. All display name changes must be approved by an administrator, and in some cases, they are not granted, but you will be PMed with the reason why if that happens.
We do advise that you chose a display name that you like, forever, since everyone on the forums gets to know you by your display name, and it would be much too confusing to allow everyone to change their names all the time. You can always change your avatar and your signature to reflect your mood.
You can submit a Display Name Change Request by clicking "My Stuff" in the navigation bar near the top of this thread, then clicking "Profile". The 7th item on that page reads:
"Display Name: (Appears with each of your posts.)
Changes must be approved by an Admin. (3 - 16 characters)"
In the text box directly below that, you can enter your choice of display names. Please be sure it follows the Forum Rules, and please be patient, as all display name change requests are manually approved (or rejected).
Please note that this information is simply to tell you about the process.