Main Menu Subitems

Hello All…I am in need of some help. I am creating a WP site using the ‘Spacious’ theme. I have created a main menu, and in that main menu i want clickable subitems…I have added them to the menu but i am unable to click them when visiting the site…when i hover over the parent menu item, the subitems show but disappear when i move the mouse to click on them….PLEASE HELP!