Fisher60,
There are numerous posts on the use of fertilizers for Cymbidiums and if you ask ten different people what they use, you will probably get 12 different answers.
Go to the Search menu on the OB header, type in Cymbidium fertilizer and browse through the threads on this subject. I am sure you will find something that will suit your needs.
That said, you should have been fertilizing ALL SUMMER long with a fertilizer encouraging growth. Cymbidiums are heavy feeders during this period. The plant should also have been in a 50/50 sun shade location. Do not be surprised if you do not get blooms due to insufficient maturity on the new growths this season.
If you do not get blooms this season, still give it as much light as possible now short of burning the leaves, protect from frost this winter, plan to repot the plant early next spring in fresh mix and get onto a regular fertilizer program.
Cym Ladye