How do I pick my fantasy squad?

Open Fantasy from your league page and tap Build squad. You choose five players from the league roster and mark one of them as captain. Three rules apply: at most two players from the same real team, at most two players from the top 20% of the league by fantasy form, and exactly one captain. You can save an incomplete squad and add the rest later, and you can change everything until the deadline. There is no bench: five players are your whole squad.