Honda civic 2008 starting issue

Please i need help;recently i bought honda Civic 4 door automatic,in beginning the battery was giving me problem few times i had to start the car with the jump lead then next day i change the battery it was doing good then after few weeks this morning the car didnt start all i could see is the lights are on the dashboard but when i turn the ignition to start the car it doesnt do anything please let me know what could be the problem???