I don't remember how to access my kx-tga931t voice messages remot

You apparently have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

You have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

You may download a copy of the manual from here. To set up the answering system, you'll want to download the manual corresponding to the base system to which you have the handset associated.

1. Dial your phone number using a touch tone phone.
2 After the greeting message enter your 2 digit remote code.
3. Follow the voice instructions.
4. When finished hang up.

The default remote code is 11
The remote code can be entered or changed on your base station.
To change/set the remote code.
1. (Menue) ---> (0)(6)(3)
2. Enter a 2 digit code ---> (Save) ---> (Off)

If you haven't changed it, the remote access code is 111.

You can download a copy of the manual from the manufacturer's web site at
http://service.us.panasonic.com/OPERMANPDF/KXTG9331.PDF

The remote operation instructions begin on page 37.

I have a similar model. You need to configure a remote access code on the phone. Then, when you call your phone, you enter the pin after your message starts.

(From the manual)
Using a touch-tone phone, you can call your phone number from outside and access the unit to listen to messages or change answering system settings. The unit's voice guidance prompts you to press certain dial keys to perform different operations.

Remote access code:
A 3-digit remote access code must be entered when operating the answering system remotely. This code prevents unauthorized parties from listening to your messages remotely. The default
setting is "111".

Important:
To prevent unauthorized access to this product, we recommend that you regularly change the remote code.
1 {MENU} {#} {3} {0} {6}
2 Enter the desired 3-digit remote
access code.
3 {SAVE} {OFF}

Below is a link to the manual. The remote access instructions are on page 35.
http://static.highspeedbackbone.net/pdf/KXTG4031-MUL.pdf

To quote from your manual:
http://www.fixya.com/support/p475286-panasonic_kx_tg5632_phone/manual-19838/page-41
Pages 41 - 42
The default remote code is 11 (two ones).
1 Dial your phone number from a touch tone phone.
2 After the greeting message starts (before it ends), enter your remote code.
The unit (then) plays back new messages.
After playing back new messages, the voice guidance starts.
3 Follow the voice guidance as necessary.
4 When finished, hang up.
--Dave

Using the answering system
remotely
1 Dial your phone number from a touch
tone phone.
2 After the greeting message starts, enter
your remote code (page 59).
LThe unit plays back new messages.
LAfter playing back new messages,
the voice guidance starts.
3 Follow the voice guidance as
necessary.
4 When finished, hang up.
Note:
LYou can ignore the voice guidance and
control the unit using remote commands

Voice guidance
During remote operation, the unit’s voice
guidance prompts you to press {1} to
perform a specific operation, or press {2}
to listen to more available operations.
Operations are presented by voice
guidance in the following order:
– Play back all messages
– Play back new messages
– Record your message
– Erase all messages
– Record your greeting message
Note:
LIf you do not press any dial keys within
10 seconds after a voice guidance
prompt, the unit disconnects your call.
LIf less than 3 minutes of recording time is
available, the unit announces the
remaining recording time after the last
message is played back.

Remote commands
You can press dial keys to access certain
answering system functions without
waiting for the voice guidance to prompt
you.
Key Remote command
{1} Repeat message (during
playback)*1
{2} Skip message (during
playback)
{4} Play new messages
{5} Play all messages
{7} Recording a greeting
message

You can download the full manual at
http://www.retrevo.com/support/Panasonic-KX-TG5776-Telephones-manual/id/1074bh748/t/2/

Please make sure to rate this solution. Thanks.

when your greeting answers, punch in your code, usually a 4 digit code, each manufacturer has their own default code that it comes with.. check the manual or website

When you call in from the outside wait for auto attendant to answer. As soon as the "Thank you for calling" starts, press [*], and your mailbox number. If that does not work you may need to put a [#], 165 before the [*], mail box. This is assuming that most voice mail and auto attendant settings are operational and you have a Panasonic KX-TVS voice mail.
If a live person (not to be confused with the living dead) answers, have them transfer you to voice mail and do the whole [#], 165, [*], your mail box thing.