missing citations

I’m looking for the references to insert in my manuscript using endnote (I need Vancouver style according to the journal guidelines).

However, I’m not able to find out some of the works I need to reference in endnote libraries.  I could add them manually in the manuscript but this will make problems with the references’ order.

Is there a solution to this problem? can such missing references be added somehow manually in endnote, so that I can then put them in the manuscript?

thank you

You can enter references manually into EndNote.

Please the attached training video which goes over the steps: