Wirelessly posted (BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
When you start you desktop manager, you have some icons to choose from (application loader, backup/restore, etc) one of them should be Media Center or Media Manager. Open media center/manager and it will show you two screens, one will be you computer file structure and the other will be your BB. On the PC side, browse to where you have your file saved. On the BB side browse to the ringtones. Back on the PC side, select the file/files you would like to copy over and just click the botton (sorry I can't remember what it says on the button right now). It should then be on your phone.
If you don't have the Media Center/Manager icon, you need to download DM version 4.2 sp2 with Media (200+ MB download) just search for it on here and you should find it. Hope this helps. Here is the link, choose 4.2 sp2 from the drop down, then choose the 231MB download. https://www.blackberry.com/Downloads...0pif2fFMgJ-Q**