Short answer, you don't. Linden labs has no intention of changing or letting you change your user (aka. login) name, unlike your display name that you can change to nearly anything and change as often as once a week.
Previous
The first is the first of this first the last is the first of the last the second and third are center of you never become such a one even for fun what is it?
The word is "sun." In this riddle, "the first of the first" refers to the first letter of the word "sun," which is "s." The second and third letters are "u" and "n," which represent "nothing." Lastly, "the first of last" refers to the first letter of the word "last," which is "l."
Last
The riddle is describing a sequence where the first letter of the word "first" is 'f', the second letter of the word "you" is 'o', the double of 'f' is 'ff' (the second letter of "off"), the first letter of the word "last" is 'l', and the last letter of "you" is 'u'. Putting it all together, the answer is "follow."
it is the first letter in your first, second, and last name
yes you are
The product is(the product of the first term of each)plus(the product of the last term of each) plus(the product of the first term of the first and the last term of the second) plus(the product of the first term of the second and the last term of the first).
1349
In Second Life, users typically create unique avatars that can have any combination of first and last names, as well as display names that differ from their account names. The platform allows for a high degree of customization, meaning that the names can range from conventional to highly creative or fantastical. However, the specific names of individual users are not publicly accessible due to privacy considerations.
First you type your last name then your first name. second for your password then type the FIRST 4 or 5 letters of your last name, last log in.
Yes, her second and last child was a boy, but as she tells in "The First Four Years", he died at two weeks old, as yet unnamed, and Laura was sorrowful about it for the rest of her life.