If you are unsure how to work with records, see the "Working With Records" section of the documentation. To get to the Shipping Method records, click the "Settings > Shipping > Methods" link:

Below is an overview of the fields on a Shipping Method record:

Courier
- Courier that provides this shipping method
Method
- Name of this shipping method
Max. Weight (lbs)
- Maximum weight allowed for a single package shipped via this method (in lbs.). This is sometimes used in real time rate calculations.
Max. Weight (oz)
- Maximum weight allowed for a single package shipped via this method (in ounces.). This is sometimes used in real time rate calculations.
Max. Length + Girth
- This field is used by some real time rate lookups. You should not modify it under normal circumstances.
Description
- A description of this shipping method