Testers find bugs (...a lot of them) during testing. To easily keep track of test process it is possible to create bug right from open TC. Use 'Create Defect' Operation on TC to forward to Create Issue screen. Underneath this operation
There are two types of defect operations:
They will link Defect with Requirements from TP or TC accordingly.
In main plugin configuration (top menu TestFLO-> Configuration or via Add-ons administration) in category Defects indicate on Test Case defect link. That is all.
Defect issue link is automatically created by the plugin, however you can indicate on a different one.