Now to start using SMS Gateway you just need to login into mobile application. First install the android application from this link.
Now open the application on your mobile and type in the following details.
Server :
Enter URL of your Admin Panel.
URL must contain leading protocol declaration (http:// or https://).
Bad : smsgateway.rbsoft.org
Good : https://smsgateway.rbsoft.org
Email :
Enter email used to login to Admin Panel.
Password :
Enter password associated with email your provided.
Just click "SIGN IN" button after providing necessary details. Dashboard of the Admin Panel will open on successful login. Now you are ready to use this as a SMS Gateway from your applications.