How SOAP can be accessed in salesforce?

Hi,

you should be able to do it one of two ways (assuming that the account you are using for development has the proper API access).

1) Add your developer machines public IP address to the whitelist.  This is something that any administrator should be able to do by going to setup -> security controls -> network access and adding a new trusted IP
2) Logging in with password & token, if your system is not on the trusted IP range you should be able to combine the users password and it's security token together and providing that as the "password" to any SOAP login calls.

For more info on the "API Enabled" permssion, see here: http://www.salesforce.com/developer/docs/api/Content/sforce_api_concepts_security.htm