The RoboForm for Android native browser supports form-filling from Identities. To fill forms from the native browser:
1) Navigate to the URL that hosts the form you'd like to fill.
2) Tap the three vertical dots in the upper right-hand corner.
3) Tap "Fill from Identity."
4) Tap the Identity you wish to use.
NOTE: When using other browsers (e.g. Chrome, Dolphin, Firefox), RoboForm for Android cannot directly fill forms from Identities.