251025 instruction change

app.py

@@ -188,6 +188,7 @@ Some things to keep in mind:
 - Physically plausible motion does not imply correct depiction of action.
 - **A video cannot portray action consistency if it has physically impossible movements.**
 - **0: indicates really poor depiction, 10: represents perfect, realistic depiction**
+- The **Save & Next** button will be enabled **only after you have clicked or adjusted both sliders at least once**.
 - You will be **paid** once **all the videos are viewed and rated**.
 """