Hi DL,
There is no direct way to change this directly in the module without modifying the source code. There is a feature build into the module to ‘Display label and field in the same column’ and if you choose this option the field will be added under the textbox fields as you want (but so will the labels, they will not appear left to right).
Another option might be to use Dynamic Forms or Dynamic Registration where you have more control over the fields and the layout… I think you could accomplish the layout you are wanting for the initial subscription with Dynamic Forms where the input button would appear at the bottom. You can see how these can be integrated here:
http://www.datasprings.com/Products....aspx#5807 There is also the option to have us modify the source code more specific to you but this would require Premium Support. You can find out more about our standard support and Premium Support at
http://www.datasprings.com/Premium-Support. Thanks,
-Chad