Can I open AutoTune in FL Studio?

yes. all you have to do is go to the mixer in fl studio. go to where you see the arrows numbered 1-8 inbetween the in and out. click on one of the arrows(a list should come up) then click on more. then press refresh. it should say "found 1 new plugin" or something like that. the autotube should be in red. the check autotune and close that window. now autotune should be on the list with all the other plugins.