1 - Use the last user creation form for Core CRM (in Icare available directly from Home page or will be provided by Support team)  :

https://solvay.az1.qualtrics.com/jfe/form/SV_8DlqGSuVE84QPMV

2 - A ticket will be automatically generated after approval by your Manager and  GBU CRM champion 

Note: only the CRM Champions can ask for an user creation