Modify Wordpress Plugin

Hello I have a wordpress plugin that performs the following function: 1. Using a shortcode, hide the contents of a post. 2. By hiding the content, the plugin creates a button instead. In order to show the content, the user clicks the button. 3. Clicking the button opens a new tab that contains a series of instructions to unlock the contents of the post. In the instructions to unlock the content of the post, the user must click on an image that is in the new window. If the user closes the new window without having clicked on the image, the content is not unlocked. In addition to this, a warning comes out that you have closed the window without following the instructions. If the user clicks on the image, a new tab opens with the url where the image is directed. When you open the url, the window with the instructions is automatically closed and the content is unlocked. The plugin performs these steps perfectly. Here is the modification I require: Currently the image to click on is in html format, for example: <a href="....."> <img src = "......." /> </a> What I need is to make the plugin recognize an iframe just as it does with the image in html format, and perform the steps described above. The iframe code results in an image (or gif). I do not need to modify the iframe itself, only detect if the user clicked or not, and perform the described steps. I will provide the zip file of the plugin.