TeXnic does not accept the instruction
for \singlespacing and \doublespacing.
I appreciate if you let me know whether I can
download them from your website.
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I don't really get it. TXC does not have to accept instructions,
it will just write them, color the syntax, and feed the source to
TeX. Now, it might be that you made an error in your TeX
source, but that is not a problem in TXC.
Is the setspace package installed on your system? If it's not,
and if you're using MiKTeX, you should install it using the
Packages tab of the MiKTeX options.
You seem to have CSS turned off.
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