Split a single post up into different web pages

I read how to split a single post up into different web pages by just typing <!–nextpage–> in the post.

When I inserted <!–nextpage–> in the post it did cut off the post precisely where inserted.

But, there is no trace of the second page or a link to it.

Where do I look for the part of the original post that now should be on the second page??

Plus, how do I put a link to the second page(s) on the first page??

Thanks for any help you can give.

Robert