Step 1- Open Snapchat on your phone. Step 2- Tap on your Bitmoji in the top left corner. Step 3- Tap Settings. Step 4- Then Scroll down to the tab and tap Support > I Need Help. Step 5- Tap Snapstreaks. Step 6- Click on Let us know. Step 7-Select I've lost my snapstreak. Step 8- Fill out a form on this page. Step 9- Hit Send to submit your form.