I can thanks because my problem is solved now. But the two first messages he sent were not help but more condescension. Anyway, I will not stay on this first experience, thanks and have a good day 
Posts by Jerichojojo
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because that's not what whitelist does
you meet to be in the friend access list.Only because you can join a server that forsnt mean you should be able to manage it and how should aternos know what account your minecraft name belongs to?
So this is the beginning of the help I asked.
Sorry but, if any question is stupid for you, don't be a helper
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So if I'm on the whitelist on an other server, why it doesn't appear on my Aternos ?
I have access, I'm on the serv right now. The problem is just, it's not on my Aternos so I can not start the serv by myself.
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I have access to their. It just doesn't appear on Aternos. So I'm here to know how to solve this
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My friend sent me this picture, in my Aternos I just have the middle icon as said on the first message
EDIT : I can not "switch" from my serv to their