Hi Jim
Right click your Document Folder and choose 'Send to Desktop' - create shortcut
That will put a new shortcut o your Desktop, right click that and choose Properties
In the Target Box you will see the location of your Documents folder in quotes
Before that add explorer.exe + a space, so it ends up looking like this:
explorer.exe "C:\Users\Dave M\Documents"
Save that, then just drag that shortcut onto your Taskbar
You can then delete the shortcut from your Desktop