If you are using the Verizon Network with a Samsung Galaxy Note 4 then you might find the MMS settings for the network below. Note that should you not be able to install the settings which are easy. Then you will need to call the Verizon help centre in your area. The settings below are only the settings for the MMS part of your mobile phone. Check this website for the APN settings for Verizon if you also want to enter these.
Verizon MMS Settings : Samsung Galaxy Note 4
Settings > Mobile network settings> Access point names
Enter name: Verizon
MMS Port: 80
APN type: default,supl,mms
Keep default values for all blank fields shown above.
Press menu button (top right) and select Save. Done.