MathWallet5 has supported Oasis Emerald. Follow guide below and start using Oasis Emerald:
First, install the MathWallet5 version from https://mathwallet.org
On the chain list click + button at bottom, and open Emerald
Then, on the chain list find the Emerald network and add a new wallet (you can import existing wallets from other chain as well)
Then you will able to receive and send tokens on Emerald
You can search and add assets to your wallet as well
For more dapps on Emerald, click: