Category Help

I am developing an app for a streaming radio station with live dj's.... everything is great so far but when i try to set in categories it is refusing everything i try... i seriously need help to get this going before our grand opening

i have been trying for HOURS and nothing will show in the drop down box and if i try to click save it rejects and says i mut choose a custom category.... i am stuck...... everything else is ready to go....

can someone please help me?