1. How do I save my level as a goo-mod file?

2. Can I add music to my level?

3. How do I make an OCD for my level?

1. Because I said so.
2. 12,090,747,589,738,975,982,895,479 seconds from now.
3. Crunchy, with a hint of peppermint.
The real answers:
1. You have to make it a .zip file, and then rename it .goomod.
2. Yes.
3. You have to type it in the XML file for the Goomod. A sample XML is on goofans.com, which makes the job a lot easier.

XD, thanks

Oh I also have another question, where do the open sources levels save to? (I mean when you click save on the editor, where does it save to?) Is it in res/levels? or something? Thank you very much!

[c://]Program Files/[WorldofGoo]/res/levels/Level Name
That is where it saves to. (The things in [ and ]'s mean that that is what the folder is commonly called.)

I figured out everything except the part where you go into the merge directory and properties with the text.sml.xsl file. I opened it in a text editor but the instructions seemed confusing, does anyone know?

yes, i know, and davidc explains. ;)
and i add:
of couse you have to change the string id, to something like "SIGNPOST_[MYLEVEL]_1"
and you have to put that ID in the "text" attribute of your signtext in the [MYLEVEL].level.xml.

Thanks for the responses. I've tried a lot to make it a goomod file, but I gave up :(.

Another question: How do I add sign post text in the Wog-editor without dycrypting it using GooTool?