In the search box put in a few keywords that summarise what you are trying to do, as well as "endnote". You may have to filter out irrelevant results, but the answer might just be there.
EndNote has an entire YouTube training channel!
There are many videos available, so you should be able to find help for almost any EndNote topic you can think of.
Please note that videos may be based on various versions of EndNote. However, the information is usually transferable to other versions, particularly if you are using a newer iteration.
As well as their YouTube channel, EndNote offers a lot of information on their website.
EndNote also provides access to an Online Community where users can join to chat and ask questions of other users.
Some institutions will not be using the same version of EndNote as you, so instructions found on the sites below may be for a different version.
However, you can usually adapt the instructions to other versions so with a little bit of creativity you should be able to find an answer.
Some universities also have Referencing guides, which have details about how to use and format in specific referencing styles. This includes APA, Chicago, MLA and AMA.