You will probably want to load one of the array's values into a hash, keyed on the field you want to correlate them with. It looks like you want to match on username, so that would be your hash key. Here's an abstract example:

my @foo = (
  [ 1, 'foo' ],
  [ 2, 'bar' ],
  [ 3, 'baz' ],
);

my %bar = (
  1 => [ 'a', 'b', 'c' ],
  2 => [ 'd', 'e', 'f' ],
  3 => [ 'g', 'h', 'i' ],
);

for (@foo) {
    my ($num, $label) = @{ $_ };
    print "$label: ", @{ $bar{$num} }, "\n";
}
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Here, the number is used to correlate the values.