Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the phone.
And would a LINK to an electronic copy of the Owner's Manual serve your need please?
Please confirm if the Panasonic's model is KX-TG6561 or KX-TG6563.
If yes, please click HERE.
The manual is in a Portable Document Format (PDF) file and can be viewed in most web browser. Click on the link to open the file or right click then select “Save As…” to download the file. It would require Adobe Acrobat Reader or equivalent for this purpose.