Alllowing app to connect any SSID and Password

I have the application developed worked. I would like to know is there any method where I could able to connect to any SSID and password so end user can use those application.

I have seen some video where user allow to login and then it allow to user to enter SSID and Password.

Later it give access to application, Let me know is there any way where end user can directly connect using SSID and password after application installed in mobile.

Search for WiFi manager on this forum, and/or “provisioning”.
You will probably want the user to input the Blynk Auth code too.

These solutions work well for projects running on a NodeMCU or ESP32 type of board. If you’re running something different then there may be a provisioning option available, but you’d need to provide more details of your setup.