I'm not sure what you mean by "previous links to work" but you don't
want to just change a user account name since that doesn't change all
the underlying files/folders of the account.
Instead, create a new user account and copy over data from the old
account, if so desired. Here is a link explaining that:
Rather than set things up incorrectly, it is time to do some major
cleanup and/or buy a bigger hard drive. You will start to experience
problems if you don't.
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