This is for FP 2002. It may be different in earlier versions.
Open the page you want the bookmark on. Select Insert>Bookmark. If you can, try to put the bookmark in front of a word, as opposed to on a word. On a word changes the formatting in Netscape.
Keeping that page open, open the page you wnat to put the hyperlink on. Insert>Hyperlink. When the Insert Hyperlink dialogue box opens, click the Bookmark button and choose the bookmark.