You can change the page order by dragging the page thumbnails corresponding to the pages you want to move to their new locations in the Page Thumbnails panel.
To insert all the pages from a PDF file before or after any page in another PDF file, select the Organize Pages tool, choose Insert > From File, and then select the file you want to insert. Specify where in the document the pages should be inserted.
To correct a link’s destination, select the Edit PDF tool, and then choose Link > Add/Edit Web Or Document Link. Next, double-click the incorrect link. Then click the Actions tab in the Link Properties dialog box, click Edit, and type the correct page number in the Page box in the Go To A Page In This Document dialog box. Click OK to close each dialog box.
A bookmark is simply a link represented by text in the Bookmarks panel.