How do I edit the 1099R part of the forms online?

On this summary page you can delete the form and then enter it again.

If an import has failed, then the best thing to do is to delete the form (1099-R in this case), and re-add it from scratch manually (i.e., don't just re-import it again). On the screen that shows your 1099-Rs (do a Search for "1099-r" without the double quotes and jump to it), you can use the Delete button to the right of a 1099-R to delete it (online).

Of course, it goes without saying that you will want to copy down all the information on the 1099-R first before deleting it.

sorry but too late for that.
I tried fixing multiple times so must delete but see no delete option on the 1099R form

You don't see the trash can on the screen shot below?