Now add all the attributes to your entities following the steps above.The steps are shown in the numbered arrows in this image below:.And also add the Data Type from the drop down menu.Now type in your attribute name and indicate whether or not it will allow Null values or it is the Primary attribute.Click on the ATTRIBUTE button at the bottom of the pop up window and another pop up window will appear.Now select the name of the Entity you want to add the attribute from the left hand side text area.
First lets add 3 attributes, ORDER_ID, DATECREATED, AMOUNT.
Now let’s add some attributes to our entities. We will create our second entity called CUSTOMER the same way. To come out of the entity window click on CLOSE button beneath the pop up window And lastly, you can enter some Comments about your entity. You can change it to Weak if that is what you want. 
The default type of entity that will be selected is Regular. Whilst you write the name, the name will appear on the text area on to your left.
From the ensuing pop up window click on the “NEW” Button and write the name of the entity in the Name textbox. Second is by using the Rectangular ENTITY ICON under the window menu. 
First, is to go the INSERT menu, then ENTITIES and you will presented with a pop up box Let’s create two entities ORDER and CUSTOMER
Or you can use the little white icon just underneath the File Menu. You can create a new blank page by clicking on File > New. After installation, open your ER Assistant and you will be faced with this page with three menus: File, View and Help. Check our ER Diagram for errors using ER Assistant. You can download the ER Assistant free software from here: ER Assistant Download. However, by far, one of the favourite ones I use is the ER Assistant which is also free.
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