To use the Admin Dashboard, you have to be aware of the functions each of Ethereum addresses has and send enough ETH to the supplied addresses, when required.
Trade ETH account is used by the wallet server to create trade orders and distribute tokens to users. All operations in the Ethereum network require ETH to run.
Assigner billing is used for the deployment of the contributor contracts. This account is used by the wallet server to cover costs of every contributor registration (deploying contributor contracts in the Ethereum network).
Transactions sender account is used to initiate the recovery process and outgoing transactions.