...
When using the auto-generate function, you simply decide the number of candidates by typing the number or using the arrows. Then click Generate candidates:
The Candidate ID can be changed. If some of the candidates are granted extra time, add this for each candidate in the Extra time (minutes) column. Finally, click Save to generate the candidates:
...
The candidates are now generated for the exam:
. Click Done to go back to the test setup
...
1. From the test setup, choose 
Manage
2. The candidat list opens. In the top right corner, select Add
3. Select One-time users from the drop down menu:
4. Select Import from file (.csv)
...