The LOC token is added by default to the webwallet.
The web wallet will has built-in capability to add tokens by entering the token's smart contract information. For example, if you want to add the XYZ token, find that token on the Explorer https://explorer.hydrachain.org/ and copy the Address Hash:
On the web wallet select the menu option Send, click the drop down next to "HYDRA", scroll to the bottom of the Coin/Token list and click the More... button.
Paste the Address Hash copied from the Explorer into the Token Contract Address field and click the blue SEARCH button.