Learn to program the remote in your Dodge Ram. In order to do so, you must have one working remote. If you don’t, you’ll have to have a Chrysler or Dodge dealer program the remote for you.
Keyless entry isn’t standard on the Dodge Ram. The base model work truck (SL model) doesn’t even have power door locks, which makes it impossible to use with keyless entry. However, most newer models do have the feature, particuarly those manufactured after 2002.