You can easily request withdrawals on uninvested capital by logging into your account, navigating to "Transfers" and then "Withdrawals". Click on "Make a withdrawal" then follow the instructions.

If you want to withdraw capital that is invested, you can sell your investments on the secondary market, which you will find under "Holdings" -> "Investments". Remember that sales on the secondary market include a fee except for special conditions for the Balanced savings strategy. Here, you have the right to sell investments up to a total of SEK 50,000 free of charge after every twelve months.