Enter your name, email and password into the text fields in the middle of the page then press “Sign Up”. You will be redirected to the app download page. The website will refer you to the app once it is downloaded and installed. Enter your email and password used to sign up and click “Sign in”. Dropbox will begin to upload them in the background. By default your Dropbox is created in “C:\Users\[Username]\Dropbox” on Windows and “[Username]\Dropbox” on Mac.  A file in the process of uploading will display a blue loading icon. This will change to a green checkmark when the upload or sync is complete. You can change the location of your Dropbox folder by clicking the gear icon in the app and selecting “Preferences”. Go to the “Account” tab and change the options under “Location”. Any files you have already uploaded will move along with the folder to its new location. You can create subfolders in your Dropbox folder and move items between them. Any folder in the Dropbox folder will carry over into your dropbox account. Create a new folder by pressing Ctrl+⇧ Shift+N (Windows) or ⌘ Cmd+⇧ Shift+N (Mac) while the Dropbox folder is open.. You can view, move, and download your files from another computer using the Dropbox app, signing into the Dropbox website, or on your mobile devices by downloading the Dropbox app. Whatever data you have upload to the Dropbox folder will appear in each other location.

Summary:
Go to https://www.dropbox.com/. Sign up for an account. Click the “Download” button. Sign into the app. Drag and drop folder files into your Dropbox folder. Organize your files. Access your files.