We made some improvements in the Edit Element Pane and this lead to some UI changes as well. As a result there are currently tutorials that have the old view and buttons. You can find the updated information in our documentation here.
Basically there are 2 options to "edit in live". Please find more details below.
1.Without an active recording session - you can use the Launch Recorder button from the ribbon in the Elements tab to try and navigate to the URL that is set in the test. That will allow you to validate the filters and navigate the DOM tree in Test Studio.
2. With an active recording session - if you already have an active recording session, you might need to select it from the Active Recorders dropdown in the ribbon. Continue using the DOM tree, suggestions and validation
I hope your will find the above information helpful and will be able to optimize the element's find expression. Please do not hesitate to contact us again, if you need further assistance.