Sending Domains

I have created few sending domains but don't see an option to select the sending domain while sending the campaign. Is there an option to select sending domain ?
 
An can I tie a sending domain to a delivery server. Like I have 12 sending domains and 3 delivery servers - I want to tie first 4 sending domain to first delivery server and next 4 sending domains to second delivery server.
 
I have created few sending domains but don't see an option to select the sending domain while sending the campaign. Is there an option to select sending domain ?
Backend -> Setting -> Customers -> Servers -> Can select delivery servers for campaigns , if this option is enabled customers are allowed to select delivery servers.
 
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