Click on the 'Plus'-icon in the "My Assessments" overview page to create a new Assessment:
Next, you can select the Questionnaire (WHAT to ask) and the Audience (WHO to ask) that will make up your new assessment. PRAIORITIZE gives you a warning when the languages don't match:
Once the languages are matching, click on "CREATE!" and you will arrive at the "GENERAL SETTINGS"-page.