If you have YouWave Home
You can add pictures to C:\Users\Public and they will appear in the following YouWave folder: /SDCARD/c/
If you have windows XP, you need to create C:\Users\Public
If you have YouWave Basic
You can use a number of cloud storage apps to transfer your pictures:
- DropBox
- SkyDrive
- Google Drive
- 4Shared
- Ubuntu One Files
- PhotoBucket (pics only)
Once the files are in youwave, you can pick the profile pic as if it were a real phone