Hello @malikaelkhadhri, thank you for your reply.
It’s no inconvenience at all. I’m happy to help! 
While logged into the platform (Log in here), please click on the provided links—both English and Arabic—that were sent to you by email and follow the instructions given on the instructions page here.
There’s no need to log in to the English Wikipedia, as that page is only there to support you with the source text. That said, in the Arabic editable page, click edit and make the necessary corrections based on the source text. All of this is outlined in the instructions.
Please let me know if you have any specific questions about the workflow that are not already detailed on the instructions page.
By the way, Wikipedia is live again.
Have a great weekend!
All the best,
Anna Canatan