The first step is to activate this setting in your Sendsteps account. We have two products where you can activate this.
In the web app you can find the response filter in your settings. You can click on the Copy button and paste the URL in the device you'd like to use while moderating your responses.

As a moderator you have the option to edit responses that are not welcome. You can think about some undesirable words used in a sentence. Or some information you don't want to reveal yet.