The search box in Telegram is rather simple to use. It entails a single search for all content, including friends, groups, messages, and so on. For detailed instructions on how to find friends on Telegram, follow the steps below:
On your favourite device, open Telegram.
Start typing your friend's username into the search box at the top of the screen.
Their account will appear under the 'Global Search' results if you don't have them as a contact.
To start a conversation, tap on their username or avatar
Tap 'Join' to join the channel if they're using it to speak with others.