1. Talk to Colm (The online Plushling in your guild on your home base)
   
   
   
   
2. Then you need to select ''Next''
   
3. Then select ''Send Home''
   
   
   
   
4. Select the player you want to be gone.
   
   
   It will list all current players in your session
   (thanks to the random person coming for flowers)

It will give you a warning that that player won't be able to rejoin for a while.
But I believe if you kick someone you don't want them back.

You can only do this if you are in your base of course.

this is my very first guide, hope it is good enough