my Blog

Since you're new and aren't aware of this (probably)

Community guideline:

14. No Advertising, Self-Promotion, or Fund-Raising

a) You may not post any links or mentions of other services, websites, or businesses from which you or an associate might benefit financially or otherwise. You also may not solicit off-Forum contact from which you might benefit, e.g. "message me for more info", “I can get you free samples”, etc.
b) Requests or solicitations for donations are also not allowed. This includes requesting contributions to “pooled fund” competitions, requests for votes in any venue (online contests, etc.), and even requests for charitable contributions. As you can imagine, we have a lot of people who would like to raise money for worthy causes through the site. As much as we'd like to support these causes, if we were to allow requests for donations, the forums would quickly become full of such requests which would take away from the main purpose of the forums - to support one another.
c) Posts or messages to members promoting websites that compete with MyFitnessPal are also prohibited.

oh I am sorry!! my bad! How do I delete it?

I wouldn't worry about it too much. Though you can always report your own thread, choose "other" and then in comments mention that you wish it to be deleted.