It looks like you're using HubSpot in French, I want to let you know we have a French Community. To access it, just click on the language selector at the top left and change your language for French in the settings: you'll then get to the FR Community.
Regarding your issue, it's probably because you're using a HubSpot Starter Template. These templates do not support personnalization. You'll need Marketing or CMS Pro to be able to use personalization tokens on your pages.
This is the issue I am also trying to resolve. It appears my version of hubspot currently does not have this personize menu. Can any help me understand why?
It's not possible in the form editor at this stage but you can personalize the thank you message of a form when it's inserted into a HubSpot page. Click on the form in your page editor and in the panel on the left you should have this option.