i have about 70 mp3's on my PC and wanna upload on my blackberry. I tried using desktop manager/roxio and it says i need a SD card to use it. Is there anyway to upload the songs to my BB with free software or whatever ??
Your phone doesn't have enough space to hold 70 MP3s. 70 songs is probably about 400 MB. The device only has 96 MB to start with and likely only has about 30 - 40 MB free space which includes all your data, messages, applications, etc.
You need to get a Media Card.
Note, that once you get the card, you don't need to use Roxio if you don't want to. You can put the device in Mass Storage Mode and just copy the files over to the card the same as you would copy any file on your computer.