Hi,
First of all, I suggest to upgrade Rapid SCADA to 6.1.0.
Then
1. Download Extra Scheme Components (plg_sch_extra_comp_6.0.0.0_en.zip)
2. Close the Scheme Editor and Administrator apps.
3. Copy the files from the archive to the SCADA installation directory.
4. Open the Administrator app, open a scheme in the editor and check if new components are available in the list.
5. In the project, in Webstation configuration, activate the Extra Scheme Components plugin.