Option 1:

If your league already decided which keepers, it's pretty easy, you can click on any square on the draftboard pre-draft and set players.

Option 2:
If your league hasn't decided on their keepers or may change their minds, we have an official keeper system.  Since you are moving your league over you need to follow these steps.

  1. On the draft board, fill it out with existing players under each column, with each column representing the team.
  2. Start and then end the draft.
  3. You'll now be in post-draft matchup mode.  Go to your league settings and "Reset to Pre-Draft Mode"

Now everyone has their full keepers from last year to choose from, and you will even have the option to choose which rounds they lose on the draftboard once they choose their keepers.

How your leaguemates should set keepers:
https://support.sleeper.app/en/articles/2219791-how-do-i-set-keepers-from-last-year-s-roster

How to set round cost for Keepers as commissioner:
https://support.sleeper.app/en/articles/2219811-how-do-i-set-the-round-cost-for-a-keeper

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