@Dreamer0563
To save maps you've made, use the following Directories:
C:\Users\[USER_ID]\Documents\CnCRemastered\Local_Custom_Maps\Red_Alert
C:\Users\[USER_ID]\Documents\CnCRemastered\Local_Custom_Maps\Tiberian_Dawn
The Map editor will memorise the location if the Directory exists (if not, you'll be taken to your 'Documents' Directory).
Note: There is a few bugs involving being able to use those Maps. The first of these is that you may not be able to use these Maps Online (not yet, due to a bug). The second of these is, when you host a Session with a map that has 8 Players, the game will crash.