1. Test creating a post
You just did. Not only this post, but a total of 12 posts on Bitcointalk.
2. Test make a post with special characters like (quote, color, insert code, font, etc)
It doesn't require any special knowledge. Just highlight a character, word, sentence, or complete post and click the button you want (quote, code, bold, etc.). Changing fonts and colors is not something you really need to do. Posting in multiple colors shouldn't be done in a normal forum conversation. The process is the same for everything else you used.
The 'Preview' button shows you exactly how your post will look like once you hit the 'Post' button. It's also a good way to doublecheck your spelling, typos, etc. before posting.