Head to www.LinkedIn.com using your browser and log in using your username and password. After logging in, you will be directed to the site’s home page.;
, Look for the box that says “Quickly grow your professional network” and enter your e-mail address there. This will let you search through the professional contacts in your e-mail address book to see if they currently have a LinkedIn.
 To add those in your contacts who have a LinkedIn account as connections just check the box next to the name and select the blue “Add to connections” box to confirm your selection.
Log in to your LinkedIn account.
Enter your e-mail address.
Add connections.
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