You can't. Only Chuck Norris has the ability to do so.
Chat with our AI personalities
You need to delete them one by one by selecting the entry you wish to delete from your contacts, select the edit button then select delete.
I've been trying to do the same. I don't know that it is possible. I've tried everything, but it seems you can only delete them one at a time. :(
make all contacts with the media
In Facebook there is a notation for new messages. After viewing these messages it is possible to delete them individually or return to the list and delete all. This is done by using the corner x.
Deleting a Frankly chat account is easy. All you have to do is go to your account and click the delete button.