I'm going to assume that this is an exchange transaction. If the amount you're receiving is big, use pushtx.btc.com otherwise you could try one of the free services offered in the forums but it could take a long time as a lot of people are sending their transactions.
Its from USI-Tech Oic but how do they really do it? I'm really interested in it haha so hope someone would teach or explain
The accelerators? They are most likely closely related to the people who actually decide which transactions will be "confirmed", / added into the new block, aka the miners.
Or paid something like a subscription fee to certain pools to get their own transactions prioritized by said pool, and are lending that feature to other people on the forum. Either out of charity or because they're trust farming/ donation baiting.
