1) Don't title your post 'Help' we all know that's why you're here. Instead title it what you need help with/finding.

2) Check previous posts. Some items as asked for frequently. Someone may have already asked.

3) Give as much detail as you can. If you're just looking for a black dress, just ask for a black dress. If you're looking for the black jacket worn by Kristin Stewart in Twilight don't presume everyone has seen that film/knows who she is. Provide an example.

4) When answering, it is okay if you only know the store it's in. Telling someone that rather than leaving them with no reply is helpful.