With the hotspot editor you can insert links into your magazine which can link to specific pages in your magazine. With those links you can create a table of contents or other navigational elements in your document.
To insert such links go to "Edit pages" on your magazine.
Then choose the page you want to add the links to on the right side. After that choose the "Navigation" symbol on the left side and drag open the hotspot element on the page.
You can then configure the element on the right side. Choose what the link should do under "Action". With "Tooltip" you can define what text should be shown when the reader hovers over the link with his/her mouse.
You can read how to change the colors of the hotspot here