How to get my social security number as an employee ?

Hello Dears,
I came to France as an employee with CDI. The HR in my company told me that in order to have my vital card, I should fill a form called CPAM and handle it to ameli . I went to ameli and they told me I should take a RDV online, and I wasn't able to find where I can have this RDV.
What shall I do to have this issue fixed and get my first social security number and obtain my vital card ?