The mod manager that comes with the game will not directly give the serial number of the mod.
Using nmm is actually the same as using mod.
Go to the folder where "My Documents" is located, find the file SkyrimPrefs.ini in the My Games\Skyrim directory, and open it for editing.
Locate the [Launcher] section, usually at the end of the file, and change the content to the following.
bShowAllResolutions = 0
uLastAspectRatio=3
bEnableFileSelection= 1
After modification, the loading mode will light up.
Note that the above work must be done whether using nmm or your own manager, otherwise you can't use any mod.
This is what I answered before.
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This thing of mine [launcher] is not at the bottom, but in the middle part below him.
bshowlresolutions = 1
ulasta spectra ratio = 4
bEnableFileSelection= 1
Change it like you said, right?