Adding a favourite is a simple thing. All you need to to is go to the page
you want to make a favourite, and click the 'Add Favourite' icon (
).
After clicking this button, a window will appear asking you what you want to name the favourite. Give the favourite a name, then click 'OK'. If you instead click 'Cancel', the favourite will still be created, but instead of a name you specified, it will have the page's title as its name.

Once the favourite is added, it will be in the drop-box of favourites, and you may use it whenever you like.