Hi,
so I have a folder on my server called /admin/

I want to have all the files and folders in the admin directory to be located at

/admin/SED/

any idea how I can do this?

I know I could use the move command, but not will *.* as it would try to move the SED/ folder into itself?

Please send the command I can use to do this, it would really help !

cd /
mkdir /admin/SED
mv /admin/* /admin/SED

And don't worry. The system is not that stupid.
Example below:

tmo@NAS:~$ mkdir demo
tmo@NAS:~$ mkdir demo/second
tmo@NAS:~$ cp *.flv demo
tmo@NAS:~$ ls demo
Trentemoeller - Moan.flv        second     elmut fritz - Ca m'??nerve.flv  
tmo@NAS:~$ mv demo/* demo/second/
mv: cannot move `demo/second' to a subdirectory of itself, `demo/second/second'
tmo@NAS:~$ ls demo
second
tmo@NAS:~$ ls demo/second/
Trentemoeller - Moan.flv        elmut fritz - Ca  m'??nerve.flv

And by the way, using an

mv *.* destination

on a linux machine could not have the effect you think.
It would only move files that have a name.extension files and directories.
If you want to include everything, use "*".

Better yet, do not use "mv", but "tar".
If you have a hidden file or directory in your admin folder, it won't be moved with a "mv".

Tar being an archive utility will backup your files and directory, even hidden.

tmo@NAS:/home/tmo$ rm -rf demo
tmo@NAS:/home/tmo$ mkdir demo
tmo@NAS:/home/tmo$ cp *.flv demo/
tmo@NAS:/home/tmo$ touch demo/.secret
tmo@NAS:/home/tmo$ ls -lah demo
total 18M
drwxr-xr-x   2 tmo webdev 4.0K Mar 27 22:55 .
drwxr-xr-x 139 tmo webdev  12K Mar 27 22:55 ..
-rw-r--r--   1 tmo webdev    0 Mar 27 22:55 .secret
-rw-r--r--   1 tmo webdev  11M Mar 27 22:55 Trentemoeller - Moan.flv
-rwxr--r--   1 tmo webdev 7.3M Mar 27 22:55 elmut fritz - Ca m'??nerve.flv
tmo@NAS:/home/tmo$ tar cvf backup.tar demo/
demo/
demo/Trentemoeller - Moan.flv
demo/.secret
demo/elmut fritz - Ca m'\303\251nerve.flv
tmo@NAS:/home/tmo$

See, the ".secret" is included in the archive, and as a bonus, the permissions and ownership on the file are saved too.
To restore them, simply:

tmo@NAS:/home/tmo$ mkdir demo2
tmo@NAS:/home/tmo$ cd demo2
tmo@NAS:/home/tmo/demo2$ tar xvpf ../backup.tar
demo/
demo/Trentemoeller - Moan.flv
demo/.secret
demo/obama.flv
demo/elmut fritz - Ca m'\303\251nerve.flv
tmo@NAS:/home/tmo/demo2$ ls -lah
total 20K
drwxr-xr-x   3 tmo webdev 4.0K Mar 27 22:58 .
drwxr-xr-x 140 tmo webdev  12K Mar 27 22:58 ..
drwxr-xr-x   2 tmo webdev 4.0K Mar 27 22:55 demo
tmo@NAS:/home/tmo/demo2$ ls -lah demo/
total 18M
drwxr-xr-x 2 tmo webdev 4.0K Mar 27 22:55 .
drwxr-xr-x 3 tmo webdev 4.0K Mar 27 22:58 ..
-rw-r--r-- 1 tmo webdev    0 Mar 27 22:55 .secret
-rw-r--r-- 1 tmo webdev  11M Mar 27 22:55 Trentemoeller - Moan.flv
-rwxr--r-- 1 tmo webdev 7.3M Mar 27 22:55 elmut fritz - Ca m'??nerve.flv
tmo@NAS:/home/tmo/demo2$