That one is a different app. I'm assuming they built it using the GitHub published code by Dorsey.
Do you have IOS or Android?
Discussion
Android
I think this is the site nostr:nprofile1qqs9pk20ctv9srrg9vr354p03v0rrgsqkpggh2u45va77zz4mu5p6ccpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgkwaehxw309a5xjum59ehx7um5wghxcctwvshszrnhwden5te0dehhxtnvdakz7qrxnfk has set up for a web presence bitchat.free with all the official links and info.
Yeah, that's easier. Until it's on the Playstore, it'll be confusing to know which is which.
Even on the PlayStore there a questionable version already 😂 I think calle will have an official one up soon though. Maybe he's getting the 1.2 update ready.