Login to RDB ProNet
Use your RDB ProNet account to login to the client.
Navigate to Plugin Store
Here shows all plugins you can install.
In the left top text box, type "Secured Signing" to search. Secured Signing plugin will be in results.
Click Secured Signing result to view the introduction of Secured Signing plugin.
Click Install button on the right.
RDB ProNet will download the plugin.
Select assignment of Secured Signing plugin.
Secured Signing plugin will be in your plugin list.