UI Components / Signature Pad
In your Backendless App go to the Marketplace -> User Interface tab and install the Signature Pad componentInstall the component to the selected UI Container

UI Components Guide - Signature Pad

This is a component for Backendless UI-Builder designer
based on the signature_pad library post by Szymon Nowak.

The component allows us to draw smooth signatures and save them for later usage.
A user can pick up any color for a drawing pen.
Also, the component has features for exporting signatures as images in different formats.
The action buttons are configurable, and thus you can adjust their visibility and labels.

UI Components / Signature Pad