t123n5

Hi everybody I am VERY new to PC gaming. Ive been a long time console gamer , but this is the firswt time Ive actually tried PC gaming largely because i want to experience skyrim mods. Im trying to install the mod manager but i cant. I keep getting a popup that says "Unable to write permissions for:......" now I have no idea what to do. Keep in mind I am very new to computers so please excuse me if I sound ignorant and have some patience, someone please help.