In order for your Orders2me online account to integrate with your MICROS 3700 terminals - you need to have Transaction Services licensed.
To verify if this is already installed, follow the below steps:
(This should be done on your MICROS server)
Hit Start, Open the folder called MICROS Applications, Then open the folder called Utilities & find the License Manager
You should see multiple tabs. You'll want to click the POS 3700 tab
At the very bottom you will see a green check box near Transaction Services (it should look the same as the below image)