Get data from a table

Hello guys i would really need your help as im a noob on this.If someone has the time to help me on this problem i would be greatfull.

So my problem is that i bought a php script the name of it is EasyForms .so it has installed already widgets for select etc…But i need for example in the select list to retrieve data of my customers that ive added them in a table named customer in my database instead writing them down manual.