Hi! I see you're having trouble finding the Minichat app on the App Store. Let's start by clarifying a couple of things to help me guide you better:

1. Are you searching by the exact name "Minichat" in the App Store?
2. Do you see any message like "not available in your region" or "this app is not available"?
3. Have you recently changed your Apple ID country or region settings?
4. Are there any specific error messages when you try to search or download it?

Often, apps might not appear if they are restricted in your country or region or if your device's settings are limiting visibility.

Here are some steps we can try together:

1. Check your Apple ID region:
Go to Settings > [your name] > Media & Purchases > View Account > Country/Region. Make sure it matches a location where Minichat is available.

2. Search with the exact app name:
Try searching for "Minichat – The Fast Video Chat" or "MiniChat - AI Chat5.0 bot" in the App Store.

3. Use the direct App Store link:
Here is a direct link to a version of MiniChat on the App Store which you can try accessing on your iPad’s browser and then moving to the App Store:
MiniChat - AI Chat5.0 bot

4. Restart your device and App Store:
Sometimes a simple restart can refresh what apps are shown.

5. Update your iOS if possible:
You mentioned you have iOS 15.5, which should be fine generally, but depending on app requirements, a newer iOS might be needed.

If after these steps you still cannot find or download the app, it might be that Minichat is temporarily removed from the App Store in your region or due to an update. You can check their official site or support page for announcements: https://minichat.com/support

Let me know how these go, or if you get any messages during the process!