Unfortunately, you cannot change the email address on your Football account at the moment, but you can instead create a new Fotbollskonto at https://konto.svenskelitfotboll.se and get help with transferring active tickets/season tickets and other services.
If you are interested in switching accounts, contact support@svenskelitfotboll.se for more help. Enter your old and your new email address, which club you have tickets with and which services you use.