I want to mark a location on google maps, how do i do this?

i cant type the address into the search thing but i no where the place is on the map, how can i mark it?
I want to mark a location on google maps, how do i do this?
Google updates its maps about once every 5 10 15 years but if you want to have something featured in the update it has to be either s square 200 ft or 200 square yards im not sure