In MacOS X if you hold down the Option key and click on the wireless setting and it will show what speed you are connecting at. It will be listed as Transmit Rate under the network that you are connected to.
In Windows 7 if you get properties on the wireless network that you are connected to and the properties window will show the speed that it is connected at.
The OP's request has not been addressed, but ignored.
In Windows 10 you can NOT edit an already configured wireless networks settings without being connected to it first. In Windows 7 you can.
In Windows 10 you can create networks manually, which exposes the GUI they want, and you can delete them as well.
But to edit them afterwards you have to at least attempt to connect to them. However if you mess up those settings and put it in a state where it would never connect it cannot be edited and must be deleted.
Best Answer
Right click on the wireless icon in the systray and select "Open Network and Sharing Center".
Then when it opens select "Change Adapter Settings" on the left side.
Then right click on the wireless adapter you are using and select "Status"