It looks like your pics were taken down.
If you are having a hard time retracting your foreskin, you may have phimosis.
Where is the ring? Is it a ring of skin that you can't pull down? Phimosis can look like a rubber band of skin around the top of your penis.
It's caused by an infection, often balanitis, and you need to see your doctor promptly. Don't wait on this.
Let us know what happens.