How to manually assign bibliography numbers?

EndNote EndNote How To
1

I have a list of references and citations already inserted. Regarding this list I have two questions:

  1. How can I manually specify that reference 1, 2 become 18, 13? I.e. How to change reference number for a specific citation and bibliography reference?

  2. How can I start numbering from a specific number? I.e. how to start from 42?

Thanks in advance