Bad news, the chances of using viabtc free accelerator right now is slim to none, 100 slots were filled by bots in a wink, now with 20 slots normal humans stand no chance of successfully submitting their transaction ID's. I reckon it is only a matter of time before they offer zero free accelerations, and for one to use their accelerator, you'd have to use the paid service, so many of their blocks are prolly filled with accelerated transactions that are not paying a high fee and this could be the reason why they have reduced the free slot to 20.