... and I'll probably say it again.
Please don't sign a contract until you've read it carefully and are sure you fully understand and agree with the terms.
Asking for clarification of anything which isn't clear is not being difficult, it's just being sensible.
If you don't understand you can't agree, so you shouldn't sign to say you do. If you don't understand there's a big risk you'll accidentally break the contract terms.
Another thing I've mentioned before is the survey on the top right of the page. Please do 'vote' for one of the options if you haven't already taken part. It's anonymous and there's no need to sign in anywhere.