Move them around until the bar is green, then click Format.
Your mouse movements apparently add randomness to the keys the program selects. Move the mouse randomly around in the window while VeraCrypt randomizes the cryptography.Decide whether you will have large files on this partition or not.Enter and confirm your password, then click Next.Confirm the volume size and click Next.You can pretty much choose any of these and it will be fine unless the NSA is coming after your data. Select the encryption method and hash algorithm you wish to use.If you are protecting an empty drive, select “ Create encrypted volume and format it” and click Next. Select “ Encrypt partition in place.” If you select the other option and there is data on your drive, the data will be overridden and lost.Click Select Device and select your USB drive from the list of devices that appears, then click OK, then click Next.Select “ Standard VeraCrypt volume” and click Next.