How can i change the message on my panasonic KXDT333

I'm not familiar with this phone, but here is a downloadable manual for this phone. Hopefully you can find the answer it it.
https://www.voicesonic.com/panasonic/manuals/KX-DT300/KX-DT333-343-346_Quick_Refernce_Guide.pdf

try this
Changing the time on Panasonic phone system

The system would have set that 165 are the voicemail ports so the voicemail must be plugged into these ports .usually the last extension on the system Once connected dial 164 then 3. 1. 1 and follow the peompts

Hello. Here:
http://service.us.panasonic.com/OPERMANPDF/KXDT333.PDF



Your welcome:)

When your system was installed, you probably should have been paying attention or asking the installer some questions. Each system is different, but the recordings are controlled from mailbox 998, the message manager's mailbox. The newer Panasonic VM systems assign custom greetings sequentially and usually we put company greetings in the first 3 or 4 slots. They're fairly easy to find and administer if you have a password and some time.

Carl

Press MESSAGES and look at the display. It will tell you where the message came from and the 3rd softkey will let you erase the message.
l

Car

Hello,

Dial your extension. Wait for the greeting to say that you are at your voice mailbox. This is also the "Quick Voice Mail Tutorial Set Up."

Follow the instructions provided in the tutorial. You will be asked to enter your name (or company name), password and greeting. Write down the password and keep it in a safe place.
Record other greetings, if needed. After the tutorial, you have an option to add different messages for different situations. Press "311" to change your general greeting. Use "312" to record a message for when the line is busy. Dial "315" to record a temporary greeting for when you are away for an extended period of time, such as vacation.

In addition, visit this link below and read the information on page 9. I think it will be of help.

http://service.us.panasonic.com/OPERMANPDF/KXDT333.PDF

Good luck.

On your idle phone, press MESSAGE and look at the display. It will tell you where the message came from and the 3rd sfot key will let you CLEAR the entry.

When they're all gone, the light goes out :-)

In a Panasonic TVA voice mail system, there are 100+32 different boxes that you can record into. We supply the map and directions at installation. Try contacting whoever put the system in, or look around for some paperwork and software to access the VM.

Unlike the old TVS systems, where we put the Day, Night, and Holiday greetings in specific boxes, the TVA has that visual **** and you don't get the opportunity to lock the greetings into specific boxes. Now, it's just sort of numeric.

Carl

I dial 500 and follow the prompts.

Carl