To appoint a Trustee select the Trust tab and select the new button and the following screen with the drop down box indicating individuals you can select as a trustee. Navigate to the individual you want and by clicking on it the individual will be added to the grid as a trustee.
Once you have selected the trustee you want click on the green save tick and the Trustees will display as below;
To edit an existing transaction click on the edit icon and you will be able to change your selection or abort the addition.
and you will be able to change your selection or abort the addition.