See if it's possible to attend a service at Former Synagogue. You'll learn a few things about the customs, traditions and practices of the Jewish faith.
If you're planning to stick around a while in Chelm, Former Synagogue is a good place to start your exploring. This Jewish house of worship is one of numerous attractions worth checking out here. Chełm Museum, and Chełm Chalk Tunnels are also waiting to be explored nearby.