Setting an alarm is easy; you just have to click on 'create new alarm', set the time you want the alarm to sound, and provide a description. You can also set the sound or song you want to hear when the alarm goes off.
Just as with real alarms, the app includes the classic snooze button, which will let you postpone interrupting whatever you're doing (normally sleeping, in this case).
One of the best parts of this app is that its interface, which is minimalist but very accessible, lets you do all of this easily.
Little Alarm Clock is an easy tool for setting alarms that has all the right functions. In other words, it's everything you want in an alarm.