The documentation of BlocksDS is here.
For an introduction to programming the Nintendo DS with BlocksDS, check this tutorial. Note that this tutorial assumes that you’re familiar with the C programming language! It focuses exclusively on Nintendo DS development, not on programming.
This is a list of interesting projects made with BlocksDS.
The GitHub organization of BlocksDS is here.
If you want to report issues with any of the repositories managed by BlocksDS, do it here.