How to add a word to T9 dictionary on Siemens SF65 ??

I'm sure this can be done, but the manual does not say how and its not easy to suss out.

So you knowledgeable folk out there....

How do you add a new word to the T9 dictionary on a Siemens SF65.

I can do it on my A62, but the same process does not work on the SF65

Any ideas  or is it not possible on the SF65?

Hope someone can help.....

TIA

DeeBee
.