How to add, remove, update and find and element

Hi,
I really like ng2-smart-table, but I am having some challenges using it, so I would like your help.
Could you please provide some examples of how to use the following methods of your component:

add(element: any): Promise;
remove(element: any): Promise;
update(element: any, values: any): Promise;
find(element: any): Promise;

In the update method, how do I find the first parameter of the method?
In th find method, what element do I use as the paramter?

How do I get the old/changed element of an update?

Thanks