If it is the sig campaign just like cohnhead said, then you just simply need to access their signature page and push the send button. The balance would be sent to your wallet. It is quite obvious and the question would be on a wrong place, then, as this thread is discussing the yobit's service.
But, if what you ask is how to send the coin from your yobit account to certain wallet, just go to the "wallet" page and click the withdrawal button and fill the address you desired the amount to be sent to.
First of all, kindly post your further question to their signature thread, as it would be more appropriate. As you are wearing their signature, I believe you have know where can you find their thread. On that thread, you'll get help easier.
And for your question, does the amount shown on certain past date? I read on their thread that there were some days that error happens which made all of the posts not counted by their bot, and its already fixed. If your problem happen just recently, have you wait for a few hours? I think it is stated on their thread too that the counting for your post didn't happen instantly, you have to wait for three or four hours for the bot to process and send the payment to your account.
I hope this help. If you have further question, please ask on their dedicated thread. I think this will be the last time I answer you on this thread.