#use the following command in terminal  (mac ) on the users computer

ssh-keygen -t ed25519 -C "[email protected]"

# Note "[email protected]" is simply used to identify the key when viewing all the installed keys on the server

When runing this command  and prompted for a "file" do not ente anything, juts hit return, this will ensure it;s written into the default users directory  ~/.ssh/

# now run this command to copy the new key into the clipboard

pbcopy < ~/.ssh/id_ed25519.pub

# note it is advised to type the above command in and NOT copy paste

# paste the clipboard contents into a TXT or emial and send to John readwin ( or whoeever is  adding the key to the server

ON the rackspace server open the file (in transmit, use edit in transmit)( ~/.ssh/authorized_keys  and paste the key from above into the bottom of this file ( return- paste save)

The user should now be able to SSH into the Rackspace Server