1. In accounts payable, choose workflow tab from heade

2. Select edit task and add single-action from three dots

3. Again from three dots open menu

4. Select group(s) / users

5. Click select

6. Remember to save

7. You can see single-action task from blue (i)-mark

After this, it's enought to review or approve this task from any of the selected users and the invoice will be moved to the next phase.