TL;DR: Just send ETH to the Purchase Address of the name you want!
1. Pick a name you like from the list on the main page. For example: rumours.eth
2. Send the amount of ETH shown under Price to the address given under Purchase Address. In this example, you would send at least .05 ETH to 0x039e06f3a697fda5a3833604a178b61d707b82d9.
3. Verify the transaction went through and that the name belongs to you on
4. Congratulations! Your friends can now easily send you ETH! And if at some point you don't like your name anymore, you can always resell it on here or wait 1 year and claim the at least .01 ETH locked in its deed by releasing the name.