Go to http://manage.windowsazure.com and login with your account which is having valid subscription.

Please follow below Steps:

Step 1: Click on below "+ New " Option.

Step 2: Click on "See All"

Step 3: Search for "Centos-Based 7.3".

Step 4: Select "CentOS-based 7.3" and deploy it.

Step 5: Please enable below ports for inbound connection on Public IP to Private IP.

Step 6: Check  SSH Access on Public IP address.