In order to see if you have a hold that that is preventing you from enrolling in classes or making changes to your class schedule, navigate to MyNEVADA and click on the Tasks tile from your Student Homepage.
From the left hand side of the page click on the Holds menu option:
This screen will show you any holds that you currently have on your account. To view more information about the hold, click on the hold you would like to view the details for: