The network isn’t live yet, so we’re not able to farm (receiving Safecoin by giving some CPU,Bandwidth,Space) yet.
The Maidsafecoins you mention are temporary coins and can be exchanged on a 1:1 ratio for Safecoin when the network is live, more info on safecoin here: maidsafe.net/safecoin.
So for now you can buy them and keep them at omniwallet.org or by using a paper wallet, if you want to use a paper wallet and learn how to buy and store them check this video How to buy maidsafecoins using bitcoins on poloniex.com