The request "[S4E5] Three-Way" could refer to a few different things, most likely a specific television episode or a technical guide for setting up a three-way call.
If you are looking for instructions on how to "put together" a three-way conversation on your phone, here is the standard process: How To Do 3 Way Call on iPhone
Season 4, Episode 5 is titled "Adaptation" . It centers on the "trio" (Charles, Oliver, and Mabel) being manipulated by their doubles and features a major cliffhanger.
While many shows have an episode 5 in their fourth season, a few are specifically associated with "Three-Way" dynamics or titles:
Season 4, Episode 5 is titled "Chicago" . You : Season 4, Episode 5 is titled "The Fox and the Hound" . 2. Technical Guide: Making a Three-Way Call