Europeiska rådet the heads of state and government set the direction
What The European Council (Europeiska rådet) is the summit where the EU's heads of state and government set out the broad political direction, without making laws.
Who Politicians in the form of the member states' leaders, so Sweden's prime minister sits at the table.
How You make a difference indirectly via the general election (to the Riksdag), because it decides who becomes prime minister and represents Sweden.