i forgot my backup password

Note that resetting the backup encryption password does not change the password of your existing backup(s). So if you are trying to restore from a backup and needing that password, you'll have to figure out the password in order to use it.

If you are simply trying to make a new backup. Then follow the instructions in the link/section provided by ProustGiulio, but for #2 the support article is currently wrong. You need to tap Reset ALL Settings

(Resetting Network Settings does not reset the backup encrypted password)

These are the only steps you can perform (section "If you can’t remember the password for your encrypted backup"):--> About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support

Regards

Giulio

Thanks for your clarification, Chris0107 :)

Giulio