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The selected tile gets placed when any of the modulo rules inside the index rule is valid.
Modulo 2 3 0 -1
If the current index's X position on the map has the modulo result of 0 (x % 2 == 0), likewise for the Y position too (y % 3 == 0), then the tile is able to be placed. You are able to shift the modulo mask, for more control over where it should check. Here, it is shifted by -1 on the Y position.
The Automapper is a tool to make mapping easier for mappers. Instead of placing the round edges of freeze by hand you could make a simple automapper rule that applies a few rules to an entire tile layer. Every automapper is made for a specific tileset and every tileset can have multiple automappers. All automapper rules are located in your teewo...