This video explains step by step how to generate an optimal lineup using 4for4 projections following these instructions:
Navigate to your desired Lineup Generator. Click "Add optimal lineup to selected player pool". Click the Lineups tab.
This video also explains how filters work for the lineup generator using an example of generating a lineup using home teams only. All position filters are specific to that position's tab. Additionally, If you click 'add optimal' from any of the position tabs the lineup generator will consider each filter individually. If you click 'add optimal' from the all tab that will use the 'all filters' to generate your lineup.
Specific to DraftKings is the requirement that you must lock in at least two players when generating an optimal lineup. This was a requirement requested by DraftKing's legal team to ensure that our subscriber base is not submitting exactly the same lineups.