Hi Pavan,
In addition to @dannish's excellent answer, here's a written guide more along the lines of the ones you usually find here on iFixit.
[link|https://www.nadiemellamagallina.com/en/manuales/smartphones-1/xiaomi-191/xiaomi-mi5-588/pantalla-completa-4610|Manuales / Xiaomi Mi5 / Fullscreen|new_window=true]
It's in Spanish but if you use Chrome the automatic translation works quite well for reading it in English.