Changing NO contact to NC (Siemens)

I was taught this when I had S-7 training about a year ago but I've since forgot the answer.
If I've inserted a NO contact into the program and want to change it to a NC contact, how do I do this? Right now I'm just deleting it and inserting the correct type.

Highlight the NO contact > Press the insert key > Click on the NC instruction. Don't forget to press insert again to take it out of that mode.

I knew it was there, just couldn't find it.
Thanks