First, make sure you have the "Bookmarks Toolbar" enabled - right click under the red 'X' & tick to enable it.
You should now have the bar underneath the Address Bar, showing "Most Visited" & "Getting Started" (or some such).
Open the first page - say AB - & bookmark it with the star that you should have in the address bar to the right of the small search box. The star will turn blue, now left click the star & from the small window that appears, select "Bookmarks Toolbar" from the drop-down menu.
You should see the bookmark appear straight away in the toolbar.
If you now right click a blank area of the Bookmarks Toolbar & select "New Separator", it will put a small line after the bookmark you just placed.
Repeat with any other pages you want to add.
If you want to remove them (or the "Most Visited" etc), hover on one until it turns blue, right click & select "Delete".
HTH