qBittorrent official forums

Hello
Would someone tell me what to do when the password for qbittorrent is lost ?
I have read somewhere that I need to edit a file ?...

"You can edit ~/.config/qBittorrent/qBittorrent.conf and remove the following lines:

[Locking]
password=zzzzzzzzzzzzzzzzzzzzzzz
locked=false

Then restart qBittorrent."

,but I cant find that file and have tried to reinstall it but the problem is still there ?!
I am using Linux , Ubuntu but I am new to it ...
Any help is appreciated

Thanks

Topic is moved from Generic here, because its related to the Linux usage of QB.