Open the file with Notepad. Find the line that says UserName=... or PlayerName=... and change the text to your desired name.
To fix the "Player One" name bug in (often found in repack versions), you generally need to modify the configuration file of the Steam emulator used by the repack. How to Fix the F1 2013 "Player One" Name Bug f1 2013 change name fix repack
If you edited the .ini file and your save game suddenly shows as corrupted, it means the emulator path changed. Revert the name in the .ini file to get your save back, or use the Hex Editor method to safely modify your existing profile. Open the file with Notepad
: Open the file with Notepad. Search (Ctrl+F) for the line containing UserName= or SteamName= . Change "Player" to your desired name and save the file. and change the text to your desired name