Ensure that your Salesforce login and password are entered correct in the "Salesforce.com Contact Linker" window. This window pops up when you try to transfer records to salesforce for the first time.
If those are correct, then you may need to use a Salesforce Security Token
To get your Security token from Salesforce,
Login to your Salesforce account in your browser
At the top navigation bar inside Salesforce, go to your name > Setup > Personal Setup > My Personal Information > Reset My Security Token.
Click the Reset Security Token button. The new security token is sent via email to the email address on your Salesforce user record. Keep this email. Your security token is not displayed in your settings or profile.
This is how you use it. As an example, if your password is mypassword, and your security token is 123456789, then you must enter mypassword123456789 in the "Salesforce.com Contact Linker" window in LeadGrabber. Here's how to reach the settings in LeadGrabber:
Detailed instructions on getting/resetting the security token are available in this Salesforce help article. If you still require help, call us / email us [email protected]