You've been given some good advice on the sensitivity issue.
As for making yourself more clear on a discussion board, you said part of the problem is spelling. (I saw the other thread that I'm guessing prompted you to start this one.) There is a spell check function on the Dis. When you are typing a response or a new thread, there is a little symbol with a check-mark and ABC above it. You can find it in the top right hand corner of both the quick-reply box and the regular posting screen. That is the spell check, and a great tool.
Unfortunately, though, sometimes people use the wrong word in a sentence. If it is spelled correctly, the spell check won't catch that. Do you have Microsoft Word on your computer? If so, try typing your posts there first, and running a grammar check. Then copy-and-paste them back to the Dis.
Finally, I've seen a few posts of yours where you don't really explain why you are asking a question. Giving a little bit of background information would be helpful. Just a sentence or two to explain what you're talking about. Then you may find that people respond more positively to your posts.
Good luck!!