Add docker swarm cluster

Rancher 2.x
1

hi guys
I have a question , please guide me .
I have 3 docker swarm cluster
how to add my docker swarm cluster to rancher ?
unfortunately can’t find document or tutorial for do this task

Thanks a lot

2

i am trying to download the docker in my pc but still, I am unable to do that. i can’t find any help even from YouTube. can you please guide regarding its download process. Thank You