Enter your Sleeper username to pull in your leagues.
For leagues the board can't read yet (like Yahoo). Type your starters and your opponent's; it scores live with the United for Rooder (Yahoo) rules.
On Yahoo, open this week's matchup page, select all (Ctrl+A or long-press → Select all), copy, and paste here. Or upload a screenshot of the matchup. Rooder picks out the players and fills both lineups, then you check them and save.
Classic NFL: QB, 2 RB, 3 WR, TE, FLEX, DST. Start typing and pick a player from the list.
Copy your lineup from DraftKings (or paste the CSV from Lineups → Export to add every lineup at once) and drop it here.