In the Governing Board or Trust Board tab (this is usually the 4th tab on your board's page) select Constitution.
Then click on the 🖊️ Edit constitution button to bring up this window.
Need to add a new member type?
Click on the ‘Add category’ button. You can choose a category, select the number of posts, set the term length and hit Save.
Need to edit an existing member type?
Click on the three dots to the right-hand side of the member type. A new window will then allow you to update the term of office length or number of posts - hit Save to finish.
When you’ve finished updating the page, just tick ‘Done editing’.