Check your bank details
Make sure that your account details are registered in My pages on the Swedish Board of Agriculture's e-service.
Link to My pages and customer information: https://minasidor.app.jordbruksverket.se/profil
Log in with BankID

Choose who you want to represent.
You are probably logged in as yourself, then you can switch. Small button ”Switch” at the top left.

Expand with the arrow.

Apply power of attorney
”Choose power of attorney”

In the upper right corner, you can expand the menu and choose to proceed to Contact information and account number.

If you have gotten lost, try this link: https://minasidor.app.jordbruksverket.se/profil
This is how it should look if you have a functioning power of attorney.
(At the risk of the Swedish Board of Agriculture changing the color theme AGAIN…)

Write the account number in one sequence without dashes, commas, spaces, or periods. The support can only be paid out to bank giro or bank account (not plus giro).

But what if it doesn't work?
If you do not have a power of attorney to edit the association's information, then it is a paper form that applies! You can find it in the web shop.
https://webbutiken.jordbruksverket.se/sv/artiklar/jsb35.html