What do you not understand about the 2-step instructions?
1) You need to create a topic "Update the system" on the forum. - You created such a topic, excellent (the wording is not important, the essence is important).
2) In your case, you still need access to the server. What is it about this sentence that you don't understand?
We cannot update your system without access to the server.
From the mailbox specified in your account, send access to the server with the box to
a.chizhik@crm-onebox.com