Network Share Setup Issues

I am having a problem again with network share. I tried to setup a network share for backup purposes and set up a directory on my c drive called RoonBackup. I created a new user called Roon and attempted to share this with the new user but all I get is a frozen screen shot. Second time I have had an issue with doing this. I sure wish roon would make this an easier process. I use an Intel 10th generation NUC.