Hello,
Please tell me the steps for integrating the Sms api as documentation is not given on the website.

Thanks

If there is no API, then how are we able to help you ? At least specify which one you are using, or the website.

IN api all this code is written .Please tell me how can i use that code

A sample HTTP API Call for Single Recipient would be:
http://abulksms.com/pushsms.php?username=kacs&password=your_password
&sender=mysenderid&cdmasender=mycdmasenderid&to=myrecipient&message=Hello

A sample HTTP API Call for Single Recipient with Scheduling (4th January 2009 at 3:30 PM) would be:
http://abulksms.com/pushsms.php?username=kacs&password=your_password
&sender=mysenderid&cdmasender=mycdmasenderid&to=myrecipient&message=Hello&shtime=04-01-2009-15-30

A sample HTTP API Call for Multiple Recipients would be:
http://abulksms.com/pushsms.php?username=kacs&password=your_password
&sender=mysenderid&cdmasender=mycdmasenderid
&to=myrecipient1,myrecipient2,myrecipient3&message=Hello

Use cUrl to request that page, the response will contain return information.