[Koha] koha usage problem

i have configured koha on redhat 9.0 n since i m not a librarian, so i m facing a lot many problems in koha usage.. these are in cat maintenance , i dunno what really i have to enter in subject maintenance for example i have made 2 categories of mystery and computer science books category n whn i enter ne 1 of these in subject maintenace it shows me nothing...title search iz working properly . also i have got doubts about the field " undelete biblio"..i dunno exactly what it means..also i have no clear vision on what have to be enterned in authorised values. _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail