Quick and easy guide to setup MyDHL Express as a carrier
Navigate to Connect > Carriers > Create Carrier and search/click on Create Carrier for MyDHL Express.
Give the carrier a suitable name (or leave it default) and enter credentials/settings under 'ShipperAccount' and 'ShipmentBooking':

ShipperAccount
Account (Required): Should contain your 8-10 digit DHL Account number.
AgentNo: If you have a specific Agent Number assigned, you can input this here.
PickupTerminal: If your agreement with DHL entails a concrete Pickup Terminal number, you should input this here.
ShipmentBooking
Printmode: Can be left empty and will default to PDF, but other accepted values are ZPL or EPL.
InvoiceTemplate: Can be left empty and will default to COMMERCIAL_INVOICE_P_10
Other accepted values include:
COMMERCIAL_INVOICE_03
COMMERCIAL_INVOICE_L_10
COMMERCIAL_INVOICE_03
WaybillSize: Can be left empty and will default to ARCH_8X4.
Other accepted values include:
ARCH_8X4_A4_002
ARCH_6X4
ARCH_A4_RU_002
LabelSize: Can be left empty and will default to ECOM26_84_001.
Other accepted values include:
ECOM26_84_A4_001
ECOM26_64_001
ECOM_TC_A4
ECOM26_A6_002
ECOM26_84CI_001
ECOM26_84CI_002
ECOM26_84CI_003
ECOM_A4_RU_002)
Username (Required): Your username for MyDHL Express services.
Password (Required): Your password for MyDHL Express services.
Testmode: Set to false for production shipments and false for test shipments.
Shipping rates
Once you have connected to your carrier, you can start building your desired shipping rates with each of the services available on the carrier.
Navigate to Connect > Order channels > Select your channel > Add Shipping rate.