How to format postings to this forum correctly?

(Sorry, this is not a programming question.)

I wonder what am I doing wrong in respect to formatting messages
on this board! Maybe somebody can help me?
- Repeated spaces and tabs disappear. Is there a way to preserve them?
- When I enter the "Post Message" Window, I find always the option
"HTML is off", and I did not find how to turn it "On". Does this
mean I cannot insert HTML tags in my messages (for example to insert
a hyperlink)?
- On the other hand, it says, "UBB code is ON". What is UBB code?
Is this the same or similar to HTML?

I would be thankful if somebody could help me.

Hans Ruegg.

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