Hello,
To get the option for the second page under hyperlink in QuarkXPress, both the pages should be in a single project and to name them follow the steps as below:
Navigate to the windows >> Page Layout
From the Page layout palette
Click on the name once and then rename it as required.
Or else since you have already uploaded second page to the server try to do the following
You can copy the link of the second page from the web-browser when it is open
And then paste it in the hyperlink box by choosing the Type: " URL"
and the pasting the link in the "URL" space
I hope this helps!