If you want to send your ETH coins to another ETH wallet, you need to use "Send" option in the main application menu. You need to know the destination ETH wallet address for this purpose. Do not forget that inside light wallet application you can make only one currency direct transactions within the cryptocurrency blockchain that you use. For example, you are not able to make straight ETH to ETC transaction.
Even more, our application supports tokens ERC20 spec, so you are able to send tokens, if you have some.
Also, while sending coins you need to remember about transaction fees. Fees applied to transaction go to support the networks that run the coin/token - so, for instance, every standard (non-smart-contract) ETH transaction currently applies a fee of 0.000441 ETH. This fee goes to reward miners and support the Ethereum network itself. Note that transactions that interact with a contract address will be more costly.