Without model numbers we can't tell what connections you have available.
Option 1 HDMI
Option 2 AV cables (yellow for video, red & white for audio)
Option 3 AV cables (3 RCA for video + 2RCA for Audio)
Some TVs have a shared composite video (yellow) and component video (red-green-blue) input. You have to choose the video type in the TV menu.
Check the manual.
If you don't have compatible outputs and inputs then you could buy a converter or update the DVD player to one with HDMI.