Navigate to Connect > Carriers > Create Carrier > Xpressen
Fill in the required details and click 'Create Carrier' when finished.
(All you will need to enter is your customer ID provided by Xpressen).
Once you have connected to your carrier, you can start building your desired shipping rates with each of the services available on the carrier.
Simply navigate to Connect > Order channels > Select your channel > Add Shipping rate.
Read more here on how to build shipping rates.