Should a group change be possible then the following second icon will show up.

Clicking this icon the adjoining dialog box appears.

Select the desired role here and confirm with OK.

If the user rarely selects roles, you can use the option Remember role selection [Remember selected role] option.

This saves the last selected role and suppresses the role dialog until the user clicks the "Change role " icon again or the saved role is no longer available for this user (setting in plinkusers.cfg).