Is it allowed to sell coins via Numista?

Hi!
I have many double coins which I want to sell.

Now my question is if it is allowed to sell coins here?
If yes in which way?
There are any guidelines?

Thanks in advance for helping me.

John3 16

 There are any guidelines? 

 There are - on top right of any page is the F A Q section 

https://en.numista.com/help/can-i-buy-or-sell-on-numista-7.html