iPad
Apple have made the setup very easy. Just follow these steps:
1. Go to the "Settings" app.
2. Click on "Calendar"
3. Click on "Accounts"
4. Click on "Add Account"
5. Click on "Other" at the bottom of the list
6. Click on "Add CalDAV Account"
7. Enter the following details:
Server: rostersms.com
User Name: Your RosterSMS.com User Name (Do not enter any spaces in your username)
Password: Your RosterSMS.com website password
Description: RosterSMS (or any label you like)