How add a Saver into a Merge3D

Help! I made this but I dont know how add a Saver!
the last node is the Merge3D1 - how can I render this to a folder?
the last node is the Merge3D1 - how can I render this to a folder?

https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=22&t=44431