I agree with Jont. There's an excellent page "HTML Hell" http://catb.org/~esr/html-hell.html, regarding all the things you can do wrong and <blink> is top of the list. Luckily Microsoft decided not to support it in IE. Only Netscape still do I think. There a many JavaScript solutions if you really have to use this. Googling for "blinking text" is the way to go.
If you really want to use these effects, all you need to know is that you should surround HTML with !!< and >!!. For details on how to use HTML, search on Google or look in any online HTML primer.
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