More About Journal Names
The pre-defined Journal Term Lists are authoritative and provide your EndNote library with the correct vocabulary to cite your references properly.
You can add journal names to the list by selecting Tools → Open Term Lists → Journal Terms List, clicking New Term then following the prompts.
Names in the Journal Terms Lists are kept with the library they have been loaded into, so they are specific to that library.
There is no limit to the number of journal names in a term list.