In general you select the object then change the hole diameter attribute in the right hand panel but you need to define what sort of hole and in what Editor you are working.
It will help you to build a dummy project and work through the Tutorial to learn the tools before you start on a serious project, as advised in:
[https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)
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Brand new interactions and interfaces. 
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