I can't understand how to do kegel exersize?

Kegel exercises: Kegel exercises work to strengthen pelvic muscles in order to maintain bladder control and reduce urinary incontinence. The exercises themselves involve tightening pelvic muscles to stop urine flow briefly and relaxing the muscles to permit urine flow. Kegel exercises can be done everytime during urination.

Try this: Picture inserting a straw into the vagina. Imagine using the muscles around the straw to draw some fluid from a glass into the straw.