Tapestries are folded for shipping. They will likely have creases when they arrive. If you want to remove them, here are 3 ways that might work for you.
1: Overtime they may fade on their own depending on how you hang it.
2: If you need to remove a crease in your tapestry before hanging it, you can simply lie it flat on a table or floor and place some books on the creased sections for a period of time.
3: If you choose to iron the tapestry, iron the backside and always use a cloth between the iron and the back of the tapestry. Start with the lowest heat until it works.