Welcome to the Make community!
The Epoch Panel is only available on Polling AND Trigger Modules, not subsequent modules in the scenario.
This means you cannot access the Epoch Panel in this scenario, as your first module is NOT a Polling trigger, but a Search module.
You need to switch to a Google Sheets “Watch New Rows” polling trigger module instead, if you want to “Choose where to start”.
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!