Update app.py

app.py

@@ -38,8 +38,13 @@ click `submit`.
 """)
 
 st.image("grobidmanual.gif")
-st.markdown("Now let's try **Paper2Slides**!")
+st.markdown("### Now let's try **Paper2Slides**!")
+st.markdown("""
+To use this space, you need to:
 
+1. Set the number of slides you want to generate.
+2. Update the processed `tei.xml` file.
+""")
 
 st.subheader('Set slide numbers')
 st.markdown("Specify the range of slide numbers you want to generate.")