Learn String Manipulation by Building a Cipher - Step 15

I am stuck here and I do not understand what they need me to do

# User Editable Region

text = 'Hello World'
shift = 3
alphabet = 'abcdefghijklmnopqrstuvwxyz'
index = alphabet.find(text[0])
print(index)
alphabet.find(text[0].lower())

# User Editable Region

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Challenge Information:

Learn String Manipulation by Building a Cipher - Step 15

you need to update the exhisting line, not write a new one

Thank You, I understand it now