Comparing Data Between Two Tables

I have two tables. Table1 contains the names of training classes being offered and Table2 has the names of the people who are going to attend. The code below lists the classes being offered and a links to add, remove, and view other employees that are attending that class.

I only want the remove button to appear if you have already signed up for the class. I also only want the remove button to appear if the username cookie equals the username of the person that is signed up for the class which means the employee that wants to be removed from the class has to do it. My insert code (not shown) puts the username in the cookie into the Table2.

I tried using this code to accomplish what I wanted above but it does not display the remove button if the person is signed up and trying to remove themself. Code: