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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
As explained above, not a kata issue.
This shouldn't be an issue. It is stated in the Kata's description in section "Placing stones on board":
"Note that the letter I is omitted from possible coordinates."
There are pracitcal reasons for it. In live tournament Go games the players may need to write down their game records to be able to recreate the game unaltered in case some issues came up at the end, for example while scoring the final game state. Beside graphical notation on preprinted empty go board sheets it is possible to record the game in simple text form (similar to chess). This is done by writing down who's turn it is and where that player's stone was placed, for example "Bh4 Wc3 Bd16" and so on. To avoid confusing i and j there is no i column in the Go board coordinates.
Be careful when specifying the alphabet for the columns, because the letter "i" is omitted in the tests :)