Hello, please note the vast majority of the community members speak English. While you are welcome to post on-topic posts in Arabic, it will limit the responses since most people will not take the time to translate your posts. I would encourage you to translate them before you post.
Translation:
"Hello my friends, I activated my account and my channel and so far it appears next to the icon for my channel an envelope and I do not have the registration button."
Could be a translation error, but I'm not sure what is meant by "registration button". Once the plug-in is installed, you will be prompted to log in to the google account and then select the YouTube Channel you want to use. Once you have completed that, you will see the TubeBuddy context menu appear across your channel page, YouTube Studio and when you search or visit other channels.
If you decide to pay for a subscription, it is very important that you ensure you are using the correct google account and you are linking to the correct YouTube channel.