If you want to get the survey ID via the web page you can:
Right click on the survey in the "ALL SURVEYS" surveys view, and press "Inspect Element" or "Inspect" depending on your browser.
In the bottom of the browser, you will see a highlighted block that starts with:
<a href="/summary/...
Scroll up a few lines until you see a line that starts with:
<tr class="survey-row" id=`
- The number that follows id= is the survey id, which you can then use in the API.