Have you connected to an event partner? When you click on the webinar, you should be able to choose an event partner by going to
Event Actions > Event Settings and choosing GoToWebinar from the drop-down in the pop up window (see picture below).
If GTW isn't appearing as an option, it is either 1) because you have not connected the adapter or 2) you already have members in the program.
If you cannot connect because you have members in your program, you can either re-create the webinar in Marketo and hook it up to GTW while there are no members, or you can go to the "Members" tab of your current webinar and choose "Select All" and then "Change Status" to
Not In Program so that you can connect your webinar to GTW while there are no members, using the event settings described above.
Also, I notived the filter for the "choose webinar time". I would suggest using a trigger for this instead of a filter (instead use "Data Value Changes" with Attribute: "choose webinar time" and add a constrain for new value is "4p ET").
Try this and let me know if it works out for you or if you need clarification! I definitely ran into some bumps setting up webinars the first time, but once you get it to work the first time, cloning them is very simple!
Best,
Jackie