How to send separate email messages to contacts from an Excel sheet?

First of all, you need to split the contacts if you want each of them to receive a separate email. To do that, use the split command.

Afterward, you need to create a loop that checks the value in the variable that stores the email addresses and sends the wizard to the correct action accordingly (Send an email if the variable contains something/Doesn’t send if not). 

To make it happen, do one of the following: 

1. Use a loop command that sends the email to each employee as long as the variable that stores the email address is Not empty. 
2. Create a loop and let it run between two steps using an If Else command.

Check out Kryon Academy, especially the Email Commands module from the Using Advanced Commands course. The demos there describe the same action suggested above: http://academy.kryonsystems.com.