specific trigger time (in demo set 5 seconds), You can set your own trigger time.
specific trigger time just you will need to remove a class
MGStimeTriggerModal from html coding
Bootstrap TellForm Form Full Responsive. You can handle this TellForm Form using a Button click event and/or using a time trigger so that the Form can auto Popup after the setting time. You can set time as you want to trigger the form Popup