To insert a bookmark, do the following in your document:
1. First try to position your insertion point at the location you would wish to mark
2. Then select Bookmark… from the Insert menu
3. The Bookmark dialog box will open
4. In the Name box, type a name for your bookmark. It should begin with a letter and with no spaces. You are allowed to use the underscore character to separate words.
If you want to insert multiple bookmarks, bear in mind that the name is easy to determine. Then click Add
If you would like to go back to the bookmark location, open the Bookmark dialog box from the Insert menu, then highlight the name of the bookmark, and then click Go To. You will now then cannot see the bookmarks in your document.
Enjoy!