How to delete songs off itunes?

Ok so I have songs on itunes on the "on my phone" bit and I tried pressing the delete button & everything but nothing is working.
the check box next to it is grey aswell so please tell me what to do I'm worried
and how to make the yellow bit go down that says "other" cos I pressed sync by accident and now it went up to 8.50gb D:
please someone help!

* I also deleted the songs in the library section and off the computer so I'm not sure what to do, I can't locate it aswell
* i have windows if that helps

(sorry for making it so long)

You remove things from an iPhone with iTunes on a PC/Mac. Details on how depends on if you have it set up to "sync only checked" or "manage music and videos manually".

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