1. 📁 Select your Stellar Blade save file:
   • Click 'Browse' button, or
   • Drag & drop the file into the window

2. 🔍 View current SteamID (if found):
   • The app will show the existing SteamID in the file

3. 🔢 Enter the new SteamID:
   • Must be exactly 17 digits
   • Must start with '7656'
   • Example: 76561198123456789

4. 📋 Transfer Demo Save (Optional):
   • Check this for demo save files
   • Removes 'Demo00' from filename
   • Keeps backup as demo file

5. 🔄 Click 'Replace SteamID'
   • A backup (.bak) will be created automatically