Head over to your site's login page https://wrendata.com/wp-admin
Head over to the appearance then menu section like shown below.
Click the view all on the tabular view on the right, then click the check-mark boxes to add the relevant pages as required. Then click the "add to menu" button, you can than arrange the layot of the menu. Once you are happy with the layout you can click the "save menu" button as shown below below.
Click on the menu item you wish to delete, this will open an additional menu, click the remove button. Once you are done you can click the save menu button.