I cant use my white soapstone. I've been trying to use it and I cannot figure out how.
There's a few reasons that you wouldn't be able to use the soapstone:
If you're offline, there's no much you can do but go back online. You can drop the Champion's Covenant by talking to the cat in Majula. If you've burned an effigy at a bonfire, the effects should wear off in about 30 minutes.
Finally, if you're getting a message similar to "Failed to create summon sign"... Well, I never figured out what causes this or how to fix it. I had one character on the PS3 that suffered from this and never recovered, but all my other characters were fine.
I also made a video explaining the first two items on the list, but there's not really any additional information other than maybe where to find the cat.