By default jenkins uses template name as cloud service name. Enter value if you want to overwrite default cloud service name. Jenkins will create a new cloud service if one does not exists already.

Rules for cloud service name
1.Cloud service name must start with a letter or number, and can contain only letters, numbers, and the dash (-) character.
2.Every dash (-) character must be immediately preceded and followed by a letter or number; consecutive dashes are not permitted in container names.
3.Cloud service name must be from 3 through 63 characters long.