The site is called LMN... what good would we be if we didn't lean into it and give you an actual recipe for home made lemonade.
STEP 1: Get lemons - from a shop, or a tree, use (borrow?? ask??) your neighbors if you don't have any
STEP 2: Juice the lemons
STEP 2.5: Get a jug, cups, sugar, a stirring instrument, a camera
STEP 3: Add sugar
STEP 4: Add water
STEP 5: Stir and drink, adjust water and sugar content suitable to your taste
STEP 6: If you got to this point you'll be a little bit upset... because here is a 1 minute video on making lemonade