I created a QuickSight account and made a type error by giving it a name as BPost-QuickSite instread of BPost-QuickSight.
Didn’t see any option available to edit the QuickSight Account name.
Would be needing your help to edit the Account name.
There is no way to change the account name once you have created it unfortunately. You would have to unsubscribe the account and then recreate it with the new name. I’ll mark this as a feature request for the future though