moved installation to new server, now cannot login (no replies)

i recently relocated my site and piwik to a new server at the same hosting group.
my site is working fine. however, piwik will not let me login with the superuser login details i was previously using.
i looked in the piwik database for the users table and saw only one record in there, which is for 'anonymous'.
i imagine i should replace the anonymous user with the superuser.

anyone know what's occurring here and the correct fix?
thanks