phpwiki and mySQL

[Kamus of Kadizhar]

I've got a mySQL error that I hope someone can decipher for me.

(LOCK TABLES page WRITE,version WRITE,link WRITE,recent WRITE,nonempty
WRITE [nativecode=1044 ** Access denied for user: 'yan at localhost' to
database 'phpwiki'])

The app is phpwiki (phpwiki.sf.net) and AFAICT my userid, login, etc. are
correct.

I know very little about mySQL.  Does the above mean I don't have write
permission to the database?  Or is this something best taken to the mySQL
list?

TIA,

--Kamus