[header] How to keep files only online on dropbox on pc or mac [title] Find and click the dropbox icon in your notification area. [step] It looks like a tiny box next to the battery, wi-fi, and sound icons on your desktop. Clicking will open a pop-up window. 
[substeps] On windows, your notification area is located in the lower-right corner of your taskbar at the bottom of your screen. On a mac, you can find it on your gray menu bar in the upper-right corner of your screen.