Write to us. A paragraph is plenty — what the thing is, or what it is doing wrong. We will come back with real questions rather than a brochure.
If you have it to hand it saves a round trip. If you do not, write anyway — we would rather have a vague email than none.
If you would rather have a mutual NDA in place before describing your idea or sending any code, say so in your first email and we will sign one before you tell us anything further. That is a normal request and we will not find it insulting.