The simplest solution is if you have write access to the files in the conf directory. If so, then you can register as a user, then in the file users.auth.php, add 'admin' to your entry--here assuming that you are 'jones':
jones:$1$eGkeCsS5$e8vsvjbivxrQ2vvvvIycvijhZ1:Jack Jones:
jackones@example.com:user,admin
If you don't have write access, since it seems to be a company server, have the IT dept do this for you.
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Edit:
Also see:
http://www.dokuwiki.org/faq:forgotten_password