Confirmation for communion

Does one need to take a confirmation class to take Communion, or just an understanding of what the Bible says?

Assuming we are speaking about normal, non-exceptional situations, yes, Confirmation would be a requirement in our churches to receive the Lord’s Supper.  It is the Confirmation instruction that provides the scriptural information people need to be able to examine themselves (1 Corinthians 11:28) and then the opportunity to make a public profession of faith and unity with other believers (1 Corinthians 10:17; 1 Corinthians 11:26).