If you'd like to keep your request private, all you need to do is uncheck the button titled "I'm happy for this request to be shown to others at Learnerbly" before you submit the request. This option is checked by default.
Note: You need to toggle off the button every time you are making a request, as this option is always ON by default. Please keep in mind that after submitting your request, it is not possible to change the privacy setting for that request.