I Bought The Beta Access and tried to join the server but it didnt let me 

it keep saying internal exception java.io.ioexception an existing connection was forcibly closed by the remote host

You need to add your MC name to your profile. You can do so in the account settings page

Https://SWDTeam.com/account

its already there in the account details 

as for the link account i cant use it only when im on the server

i cant join the public too