How to Change info Window Content with My Own Text In Google map

How to Change info Window Content with My Own Text In Google map

How to Change info Window Content with My Own Text In Google map
i using following url to get google map
https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=51.4476,-0.355091&ie=UTF8&z=12&t=m&iwloc=near&output=embed
i need to change that yellow color box content with my own text