editing an existing MOGRT template with clickable fields

[Kinetic Images Australia]

Latest Mac IOS 10.15.6 , Latest PR 14.3.1 (Build 45) and have imported AdobeStock_301459356.mogrt.

I can change background colours, text and placement etc but I cant see how I can place a previous video and next video into the MOGRT nor can I see how I can make the centre "Click here to subscribe" clickable.

Any advice would be appreciated.