how do you "uncomment" a line?

its for the kernel compiling instructions... i see the line, but, what do i add, what do i take out, what does uncomment mean?

A comment is a line in a program or script that is there just for us humans it is ignored by the computer. A comment is indicated differently in various languages. In c++ it's:
in basic:
and in shell scripts (bash scripts):
So depending what aspect of the kernel you're working on (source code level or configuration level) it's going to be a line starting with either // or #

To 'uncomment' a line means simply to remove the # or // so that the line is no longer ignored by the compiler/computer and the code now takes effect.

If you're configuring the kernel prior to compiling, you should probably be using a graphical tool, for example by running:
make menuconfig
make gconfig
or
make xconfig

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