Let's do this first. When you feel the need to pee, get somewhere that a little mess won't hurt. Pinch shut your foreskin with your fingers and start the stream. If your foreskin balloons uniformly, it is not attached to the glans. If it is not uniform, there is an adhesion which you should be able to work loose by massaging it. This may take some effort, so be patient. Report back on what you find.
Let's say you get a positive outcome with no adhesions. This is where I suggest starting to get that ring on the end loosened up.
This should get this started. Let us know how this one works and we'll go from there.