To find someone on Snapchat, open the app and type their name or username into the search bar. If they allow others to search by phone number, the account should appear in the results. To find someone on Snapchat, open the app and type their name or username into the search bar. Then, at the top, tap the search icon. Then, enter their phone number. If they use Snapchat and allow others to be found by phone number, their account should appear in the search results.