Sorry if this has been asked before...

[GaijinOtaku]

...but how do you mark something you say as a spoiler? I'm a newb to this site, so I don't really know how ^^;

[SeedFreedom]

use the spoiler tag.

Its on the top toolbar of your post box. Its a yellow triangle with a character peeking out occasionally

Or you can use the tag format. Ignoring the ! character, it looks like this:
[!SPOILER="Enter you spoiler title here"]OMG SPOILERS[!/SPOILER]

and turns out like this:

Spoiler for Enter your spoiler title here:

OMG SPOILERS

[KholdStare]

I would like to add that you should always label your spoiler, which is the text after the = sign in [spoiler=____]

If we see something like this:

Spoiler:

OMG Sakura dies in G**** P*** M*****.

Then we have no clue if we should click on the tag or not. But if we see this:

Spoiler for Lucky Star major plot spoilers:

A bit of humor is good, non?

Then everyone is happy.

[GaijinOtaku]

Okay, thanks so much!

[White Manju Bun]

Gonna add one more small thing, remember to only put spoilers in threads that allow them. Episode discussion threads may not contain spoilers to future events even if its in a tag. Read the Spoiler Policy if you have any questions.