If you want to move your funds in Atomic, you need to import the private keys from the wallet(s) you used to store your cryptos.
1. Go to the Settings menu and select "Import".
2. Select the asset and enter your Private key.
3. All spendable coins, expect network fee, will be sent to your Atomic address.
Atomic Wallet doesn't support import of mnemonic seeds and 12-word back up phrases of other wallets and products.