Masking effect – Poshlight - Surreal special effects image blender, instantly posh your photos! Review

Okay so I really like the effects and what not but when I go to the masking effect and I want to mask it on two sides it doesn't let me. It only let's me edit one side. I was trying to make it look like a galaxy was inside something and so I masked one side, I went to go mask again and it would let me do the other side. Please fix this.
Review by Asyed516 on Poshlight - Surreal special effects image blender, instantly posh your photos!.