Extensiv Integration Manager will automatically load all the available ship methods from ApparelMagic once you setup the connection. 

To load or re-load this list in Integration Manager, go to WMS Setup and click Test. 

You will see a list of available ship methods in Integration Manager Ship Methods > WMS Shipping Method List.

For instructions for how to map from your shopping cart ship methods to the ApparelMagic ship methods, read this: Ship Method Mapping