Hi @dimasaosin, thank you for reaching out here 
In order to work on a translation or revision task, you’ll first need to claim it by following these steps 
Then, you need to complete your task using Memsource, our new translation interface; in this section you can learn everything about it! I also invite you to check this 30 minutes webinar on how to use Memsource 
Once you’ve worked on your task, you just need to follow these instructions to submit it.
I hope this helps, but don’t hesitate to reach out if you have further questions 