You do need DTUBE to generate bandwidth in order to transact, if your account was created by @dtube or created before HF4.

DTUBEs may be obtained through Pancakeswap or Apeswap, my recommendation is to use a DEX aggregator to get the best rates. The token contract on BSC is 0xd3cceb42b544e91eee02eb585cc9a7b47247bfde. Then use the bridge in your channel page to move it to Avalon (or manually call the transferToAvalon() method in bscscan).