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You can only post a blog if you do one of the following:
Donate to a Tier 2 Supporter or higher
Become a staff member
Reach a total of 5,000 non-spam posts
So yeah, you can't post a blog right now but if you achieve one of those things above you can. Remember, getting to 5,000 posts is harder than donating so getting Supportership is definitely the easiest option.