Step 1: After joining the Webinar select the attendee name you want to make presenter.
Step 2: Click on the Make Presenter tab to enable the Presenter rights for the user.
Now the attendee can use the Whiteboard and share screen feature as a presenter. This will give all the presenter rights to the user.
To remove the presenter rights from the user follow the next steps.
Step 3: Click on the icon that reflects you on the Webinar.
Step 4: Click on the Take presenter button and now you will again get the presenter rights for the Webinar.