How to set SMS reminders for Samsung SGH-i7 18+?

I also used i7 18+ mobile phone to experience it personally:

If you want to set the downloaded music as ringtone, put the ringtone in my ringtone folder in the memory of the mobile phone, and you can find the ringtone when setting the ringtone of the incoming call;

Set the SMS ringtone, first convert the ringtone to wav format and then put it in the windows folder of the mobile phone, so that you can find the ringtone when setting the SMS ringtone.