On the Edit Methods page, you will have three options to add a shipping method:
General Methods - Mark the checkbox next to the general method. Leave unmarked if you do not wish to use the method. Unmark the checkbox to delete the method.
Custom Methods - Enter a custom method--such as USPS--into the custom method field then click the Add button. Note: Although they will display correctly in Shipping Manager, some special characters--such as the plus sign (+) and the ampersand (&)--won't be recognized and may not display correctly in your live checkout. This will cause an error or other unexpected behavior during checkout.
Note: To delete a custom method, click the trash can icon next to the method.
In Shipping Manager, you can edit the display order of your shipping methods. Shipping methods will display in your checkout in the same order in which they display under Selected Methods.