Step 0: Signup. We just need your email address.
Step 1: Set your password to something you'll remember.
Go to the Accounts page and select a password you'll remember.
Step 2: Register your addresses and devices.
You can register all your devices from the Accounts page. It'll only take a minute and will enable you to send expenses from whatever device is available to you wherever you are.
Step 3: Try out your devices: send in sample expenses.
Test your various devices by using them to send expenses. You'll also want to add Xpenser to your various addressbooks (add the email address, the SMS number, the IM bots, and the phone number).