I received the first notice of examination opinions at the reexamination stage of the patent application. How can I modify it? How to submit the revised claim through the client?

If only the claims are modified, only the claims need to be modified. Mainly according to the examiner's review opinions, and then make an opinion statement. The revised application documents and opinion statements can be mailed to the Intellectual Property Office, forwarded to the agency, or directly submitted to the electronic client.

Nowadays, electronic clients are widely used, the fastest, followed by agents, and finally email.