Snowflake is a cloud-based highly scalable database (see http://www.snowflake.com for more information).
The first step, as with any external connection, is to create the data connection in LityxIQ. See https://support.lityxiq.com/277108-Data-Connections for more information on creating and managing external data connections. Note that when setting the connection settings for Snowflake connections, you are required to enter the Compute Warehouse name from your Snowflake account. See Snowflake's website or your Snowflake account for more information on compute warehouses.
The second step is to import raw data from a Snowflake table. Since Snowflake acts much like a standard SQL database with respect to how one interacts with it, importing Snowflake data is much like importing data from other SQL databases in LityxIQ. See https://support.lityxiq.com/096794-Import-Data-from-a-SQL-Database-Table for more information.