Indeed, the camera does not come with a cable release but the shutter button is threaded for one. Just buy your every day cheap standard cable release from any number of vendors and you'll be fine. The release will work on any number of cameras out there and will last as long as you own it.
Have fun with the camera! I have one and several pinhole cameras I've made myself. I'll confess I tend to use the Holga a lot more than home made ones. The wide angle and long negatives are a lot of fun!!!