You can't do that at your own unless you speak and read Greek. Most often it is beter to simply let your agent who incorporated the company in Cyprus for you to do the task. It's not very difficult and also not expensive!
You may want to let your Agent do this task for your if they can, since it can be complicated to submit it to the tax authorities and get it approved.
For a loong time we have been using the same tax firm and just pay what he invoice say. Never actually thought about to change since we never had any troubles!
Switching accounting firm or tax auditors is not always the best to build trust towards your customers. If they check your company they will ask questions why you did so..