Thank you page after using sign up widget?

Hi,
I am using the Action Network Signup widget on a few pages. When I test it to see what happens when a user submits their info, the page just appears to reload. There is no indication that the submission was successful.

Should there be a “thank you” sort of message coming up, or it is possible to create one? I see no options in the Settings. I can’t find any details on creating custom thank you pages, although this is listed as a function in the plugin.

Thanks for any help!