Converting one way circular road to roundabout

Hi, I’m trying to change this junction to a roundabout. Currently it’s just a one way road, so the turn indications are wrong.

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What’s the best way of doing this? I tried creating a roundabout but even if I set the A127 underneath the roundabout to be level -1, it still tried to connect it to the roundabout.

I didn’t change anything in the end, just in case I messed up. Actually I did change the “sides” to be level 1 instead of 0. Does this even make a difference to anything (I know this has nothing to do with my original question).

There’s no easy way unfortunately. Pull the A127 out of the way then create a new roundabout over the top (it won’t fit), reallign it all and then move the A127 back.