anyone knows how to add this node?
Yes, you are adding two vectors. The question for you, is what you are trying to add and why. Watch this video:
I already answered your question. Please watch the video, learn how to add vectors. I mean, I still don’t understand what you are wanting to do other than wanting to add vectors.
If you cannot add vectors on your own, perhaps LERPing between two vectors would be easier for you?
Also, do not do this on tick.