Click on the Customize button to specify how user input should be managed. For example, in the Company dropdown, choose the form field where users specify what company they represent. This way, the company name will be placed in the corresponding Salesforce lead or contact field.
Press Save, then Save again in the main Salesforce box and the application is enabled. If you use more than one-page layout on Salesforce, make sure you use the dropdown in the customization lightbox to select the layout that contains the fields you need. To see what fields each layout contains, select the layout in the dropdown and scroll down to see the fields that are shown. Also, you can add an opt-in checkbox to your form. Before having their contact data sent to your Salesforce account, form users will be asked for confirmation. This option is automatically enabled when checkboxes or radio buttons are added to the online form.
Note: Salesforce provides API access, which is needed in order for the two apps to communicate, starting with the Salesforce Enterprise service plan.