In your environment,
1. Select Synthetic in the navigation menu.
2. Click the Add synthetic monitor button.
3. Click Install Dynatrace recorder. This button appears only if you haven't yet installed Dynatrace recorder and after you enter a valid URL.
4. When prompted to Add “Dynatrace browser clickpath recorder, click Add Extension.
See more info on recording a browser clickpath here
Hope This Hepls
See image attached. Click the drop down menu aka hamburger menu (3 horizontal lines stacked). You should see the Synthetic button below Applications. I have also highlighted it in the image. Please let me know if you have any further questions.