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They mean there's an underscore in the username. Most computer systems don't allow spaces in usernames but are perfectly happy with underscores.
Depends on what you mean by contain.If you mean, contain it so that it cannot get out, then yes, you can, if you shine it into a dark container with no way for it to leak out.If you mean contain is in store, then no, you cannot.
Probably "spaces". As in skip spaces.
You mean "What is captain Rockhopper's username on club penguin?". The username of Captain Rockhopper is Rockhopper.
The user name should only contain letters in the alphabet and numbers. examples of acceptable character would include: 0123456789 abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ All other characters are not accepted.
If you mean your username- you are not able to change your username as of March 1st, 2010.
It cannot contain 3 of the same letter/symbols in a row. For example, EEE.
Your username/your account.
user=username
It means username.
Other users cannot see your email on Instagram. However if you mean to login you can choose a. username. For example "ExampleName123". The general answer to your question is "Example@Example.com"
If you mean whether you can use your name as your username, the answer is yes. Provided others don't have that same username.