To lock your Bank Of America card open web-site.
Login to your account.
Click on the bank of america checking account.
On the next screen find the section with Services and click on Lock/Unlock debit card.
In card settings find the switcher - lock your card.
Click on it.
On the dialog you should confirm that you want to lock your Bank Of America Card.
It should confirm that your debit card was successfully locked.
To unlock your Bank Of America Debit Card click the switcher again.
Then you should confirm that you want to unlock your debit card.
Next you should see confirmation that your card was successfully unlocked.

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