cinnya

I made this for a friend and everything went well until I had to add the binding.
I cannot figure out how to get the binding into the sharp corners. you can see how it ripples if I leave it in one piece, I cut the binding on one side just to see if it would lay straight.
I don't have a pattern I can follow, just seen this runner in a picture.
Needless to say I am so frustrated, I would like to make her another one, because I will not give this one to her.
She doesn't know she is getting one, so I have time to make a new one, if I can get the binding right.
Arghhhhh I meant to post that in the main forum...sorry