Please note that the link you're giving on the O'Reilly books is on a site (presumably in Ukraine) which most probably does not have the right to publish these contents on the Internet. In other words, it is most probably illegal, and I would advise you to update your original post and remove the link.
Otherwise, everything important is done in the insert subroutine and it seems to be it is pretty much straight forward: if the value of the current node is larger than the value to be inserted, go down into the left subtree (by calling recursively insert on it); if it is larger, go down into the right subtree (also calling insert recursively); if it is equal, it is a duplicate, just ignore it; if the node is not defined, then create it, you're at the right place.
What is it that you don't understand?
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