1
Look at the function keys (F1 - F12) on your keyboard, if one of them has a touchpad icon with a line through it, press that key or Fn + that key to test if that enables the touchpad.
I checked online and some Infinix laptop models use the F6 key.
2
If that does not resolve the problem, you need to go to the support page for your laptop on the Infinix website to get the version of touchpad drivers they recommend for your laptop model.