The username and password you use is the same one you use for the desktop site. If you have forgotten either of those, you can reset them from the desktop site.
Your username and password is case-sensitive. Ensure that you are using upper-case and lower-case letters appropriately. Some mobile devices will try to automatically capitalize the first letter of your username.
If you are signed into the mobile website, signing into the DAT Load Board for Truckers application will kick that user out and vice versa. Note: You can be logged into the desktop site and either the mobile website or the DAT Load Board for Truckers app simultaneously.
Brokers are able to log into DAT Load Board for Truckers, but there is no ability to post loads or search for trucks. If you are a broker, you should continue using the desktop site.