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kiendtkavana1.397535393557659E12kiendtkavana1.397535393557659E12 

hi saleforce, i need to enable API access. I want test some thirst application.

hi saleforce, i need to enable API access. I want test some thirst application.
DonRobinsDonRobins
While it's not clear what kind of testing you wish to do, you can start with exploring the SOAP API with the online documentation found here: http://www.salesforce.com/us/developer/docs/api/index.htm, or if you need a REST approach, there's similar documentation found here: http://www.salesforce.com/us/developer/docs/api_rest/index.htm

There is a substantial amount of content regarding connecting to and using the various API's on developer.force.com, but you'll have to search for it based on what you want to accomplish. 
kiendtkavana1.397535393557659E12kiendtkavana1.397535393557659E12
thanks for information.
When i retry connect data source of Saleforce. I have error:

 User-added image

please help me 
DonRobinsDonRobins
What kind of org are you connecting to and what is the user license of the user whose credentials you are using? Do they have a profile where the API Enabled permission is checked?
kiendtkavana1.397535393557659E12kiendtkavana1.397535393557659E12
oh, i see. I live in poor coutry. I want test personal connect saleforce with tableau. Can u help me?