For most games open up the map from the menu and press the select button or key on one of the locations, usually you have to have been there before to unlock the fast travel option. It would help to know what game you want to know about Online for example uses wayshines instead.
Generally, you must use the 'Wayshrines' found in the world to fast travel. This is different to previous games where you could go directly to a map marker. You can teleport from anywhere to a wayshrine for a cost (I think this is dependent on the distance but so far it has been around 62/64 coins) You can travel from wayshrine to wayshrine for free.
Still don't know what game 174.171 wants to know about, the page that has links to the pages for each games version of fast travel is here (but it would help to know what game so i can move this in to the correct games form section after).
What do you think?