how does one "activate" this
https://i.imgur.com/B6cGflE.pn
In the Services Section of the control Column on the left hand side, click on the type of system you are trying to set up. If setting up your NAS for Windows, you'll want SMB/CIFS, make sure that it's enabled in the settings then click on "Shares" in the top. Click add, and you'll see the UI to add your shared folder to that system. Configure it how you want it, then click on "Save."
Hope this helps.