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Omaha High: exactly two of your own and three common
In Omaha High, the player has four hole cards, but the final five includes exactly two of them and exactly three cards from the board.
Rule 2+3
The five community cards are dealt the same way as in Hold'em: a flop of three, turn and river. To compare hands, pairs of four of their own cards and threes of five community cards are sorted out. The best possible five is the player's score. You cannot take one of your own cards and four common ones, even if this would result in a stronger set.
Common flush mistake
Three spades on the board and one spades in your hand do not form a flush in Omaha. For a flush you need two of your own spades and three common spades.
Shansio shows 1 to 5 opponents in this first version of the calculator. This is a service limitation and not a general Omaha rule.
Source of rules: PokerStars, Omaha.
A separate example: why one card of the suit of a hand is not enough for a flush.