Thanks for that confirmation of the system model number.
As mentioned earlier, this particular system does NOT have a built-in Answering system.
So I will assume that you have a SEPARATE answering system of some kind - either as a stand alone device in your home OR a "Voicemail System" - which is a SERVICE/FEATURE of your phone service provider.
If this IS your provider's Voicemail System, they should be able to provide you will DETAILED instructions on how to retrieve your messages, and those can usually be found on the provider's web site, or perhaps on an instruction sheet what was given to you when you started your service.
But I can tell you that MOST service providers allow you to dial an "Access number" to get your messages and then have you enter a "security code" to get into your messages.
That access number MAY be a separate number OR your own phone number OR perhaps just lift a handset, listen for a dial tone, and then dial * 9 8 (or *99).
Again, your SERVICE PROVIDER should have DETAILED instructions for you, so I would recommend checking their web site OR contacting their Technical Support folks to get those instructions.
Please let me know what you find or if you have any more questions.
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Thanks, ***** *****