You can delete your HeiaHeia account if you want to. Be aware, however, that it is a permanent action that cannot be reversed. In case you are deleting one of multiple accounts, make sure you're about to delete the right account.
To delete an account with desktop HeiaHeia:
1.) Go to your account by clicking your profile picture or small arrow next to it. From the dropdown select "Settings".
2.) Scroll to the bottom of the "Settings" page. There you can click on "Delete my HeiaHeia account".
To delete an account with mobile apps (Android or iOS): Go to Account > Delete my Account