How do i get on smile basic source with a 3DS?

You don't. The 3DS browser sucks.

A better choice would be almost any other device with internet access. The 3DS browser isn't very good.

99% sure the owner removed support for the 3ds as it was a pain in the butt to code for almost no users.

hmm... tru dat.

It works fine on n3DS

n3DS browser is actually okay. Not spectacular, but better than the old 3DS's browser. Still don't think that SBS will work on the 3DS browser, though.

Then again, i've never tried.

I can confirm as I have both a N3ds and a 3ds that SBS doesn't work on either (Also, is it just me or is SBS down again?)

It's back up. They are having glitches atm.

The site does work on the n3DS browser, but you can't use it under HTTPS. You have to change it to HTTP for it to work on that. Probably doesn't work on 3DS.