Final answer:
The most likely cause preventing Megan from submitting her registration is a script blocker. Script blockers prevent scripts from executing, which are necessary for form submission. She should check her browser settings and disable any script blockers for the website.
Step-by-step explanation:
If Megan struggles to submit registration information on the Sierra club's website and clicking the Submit button yields no response even after several attempts, the most probable cause is that there is a script blocker active. Script blockers are browser extensions or features that prevent certain scripts from executing on web pages.
These scripts are often necessary for web forms and buttons to function properly. If a script blocker is in place, it could stop the registration form's submit feature from initiating the necessary action.
While it is possible that the website is not secure, or that Megan has pop-up blockers misconfigured, or that her browser's extensions are disabled, these are less likely to be causing the issue with submitting the form. A lack of security on the website does not typically interfere with the functionality of buttons, pop-up blockers would not prevent a submit button from working, and if browser extensions were disabled it would not selectively affect the submit button.
The best course of action would be for Megan to check her browser for any active script-blocking features or extensions and adjust the settings to allow scripts from the website she is trying to interact with. This could involve checking the browser's address bar for any script blocker icon, entering the browser settings, or consulting the browser's help or support documentation for guidance on managing script permissions.