Transferring Warframe to Another Drive to Make Room for Optimization

[-QUILL_PETER-]

When I try to go ahead with the Optimization prompt, it tells me I don't have enough space (Needs 18GB for reasons.) 
I tried to delete it from the Drive it's on (C:), but apparently that was just personalized data like settings and such.
Anyone here know how I would go about making the game save into the much larger (D:) ?

Basically, how do I change where it saves to?
It's on (C:), how do I get it to (D:)?
This is where it's currently at:

Edited March 15, 2019 by -QUILL_PETER-

[Drasiel]

okay so there are two parts to a warframe install the "user data" and the "game data" by default it puts everything (user data and game data) into your User data area. If you are a steam user or have chosen a custom install location then it puts the user data in the user data section and the game data in the selected drive location. So you need to tell us where your game is installed in the first place for us to help you. Sorry I gotta run meeting people for a movie.

[-QUILL_PETER-]

18 minutes ago, -QUILL_PETER- said:

the Drive it's on (C:)

^

[Drasiel]

16 hours ago, -QUILL_PETER- said:

^

excellent I see you are using steam! that actually makes this a lot easier.

1. open steam
2. go to settings
3. click downloads
4. click the steam library folders button
5. click the add library button
6. browse to D
7. press new folder button
8. click okay
9. click select
10. click close
11. click okay
12. minimize steam
13. open the steam folder on D
14. open "steamapps" ( if it doesn't exist make one and open it, no quotation marks)
15. make a folder called "common" (no quotation marks)
16. Copy your warframe folder from C to the "common" folder you just created.
17. maximise steam
18. right click on Warframe in steam and select delete local content
19. when done click the install button
20. In the choose location dropdown choose the steam folder on D
21. Instead of re downloading steam will detect the existing files.
22. Let it finish
23. boom warframe on new drive.