Do a bit of story telling about why you want this or that. Try to make a good case of it.
Post as most as possible, code, backtrace, steps to reproduce, what did you tried, etc. In a structured way.
Assume you may be wrong. Use words like "Maybe", "We probably should", "I may be misguided, but", etc.
Format it correctly, check for spelling and errors.
Finally, reply back when asked for stuff.
It's not that hard, but most people aren't doing it.