No self-meriting is not possible here in the forum. If it was, so many users would have been abusing it and that would also defeat the reason why the merit system was introduced in the first place.
That's what I was about to write--it's never been possible, and I'm pretty sure Theymos thought of what kinds of abuse would be tried by idiots trying to rank themselves up, and being able to give your own posts merit would be the prime way to do that.
Can you imagine if that were possible? It's bad enough that there have been so many members caught sending merits to alt accounts or friends or for some sort of remuneration; if self-meriting were possible, we might as well not even have the system as it'd be too broken to be effective.
OP, if you've got your question answered you might want to consider locking this thread.