The SDL Machine Translation Edge Plug-in does not seem to like the API Key, since the relevant box is greyed out.
You have not entered the Host address and this is required.
Even with the Host, it doesn't work :(
Then the next step would be to make sure from your customer/employer that the API key is correct. If you're very sure it's all correct then you'll have to drop me an email at email@example.com and we'll need your login credentials to troubleshoot this.
Thanks, I just sent you an e-mail.