You can't. If you want to add music, you need an SD card.
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first you need an SD card and copy your photos to the SD card then connect/insert it to a computer and transfer the photos to your computer
Yes, you can connect to a wi-fi hotspot with your DSi.
You need to connect to the DSi store, and pay for them there. You can then download them to your DSi.
in pictochat or download playSimple! Use your DS Download Play!
It means that your DSi can not connect to the internet because of an IP address issue.