Run the mech-dump utility that installs with WWW::Mechanize and see what that says the fields are. 

$ mech-dump http://perlmonks.org/
GET http://perlmonks.org/?
  node=                          (text)
  <NONAME>=Search                (submit)

POST http://perlmonks.org/? [login]
  node_id=131                    (hidden readonly)
  op=login                       (hidden readonly)
  user=                          (text)
  passwd=                        (password)
  expires=<UNDEF>                (checkbox) [*<UNDEF>/off|+10y/remembe
+r me]
  login=Login                    (submit)

POST http://perlmonks.org/?
  node_id=131                    (hidden readonly)
  foo=Refresh                    (submit)

POST http://perlmonks.org/?
  displaytype=display            (hidden readonly)
  node_id=607758                 (hidden readonly)
  vote=0                         (radio)    [*0/obsessively|1/often|2/
+infrequently|3/-ged, but I quit|4/I'm tempted to|5/I never considered
+ it|6/I can't imagine doing that|7/What's "blog"?]
  <NONAME>=Vote                  (submit)

[download]

In reply to Re: Login to new bugzilla by Fletch
in thread Login to new bugzilla by T

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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