To activate it, just throw one enderpearl nearby. Depending on the height of the plant there will be a different range, the carpet need to prevent it from growing, because it only works with the Chorus flower. If you don’t put any plant on it can only receive. Finally, each teleporter works with its own color.
Mini slideshow on how teleport using Chorus works in a datapack I made byu/EmergencyCap4343 inMinecraft